This seems to be something many young students haven't quite "got" yet. It's a "firm grasp of reality", especially important in the hype of the game industry. And it's an ability to "think critically", to analyze what you hear and decide whether it is likely to be true or not.
I was educated as an historian. One of the things you learn is skepticism about information sources, though some historians seem to lose that skepticism at times.
Many of the stories "everyone knows" are in fact apocryphal, never happened. Something sounds so good it gets attributed to an historical figure who in fact had nothing to do with it. This is true even for living people. Half of what Yogi Berra is supposed to have said, he didn't say. (One of his "Yogiisms" is, "I never said half the things I really said!")
Furthermore, people write and say things that aren't true, sometimes by accident, sometimes deliberately. I am personally skeptical of memoirs that discuss in detail something that happened 20 or 30 years before, especially if it was during the writer's childhood. If the writer didn't keep a diary at that time, I think to myself, how can he or she remember all these details? *I* don't remember that kind of detail, though my memory generally is excellent. So how much do they get wrong, or are they making up?
Lawyers know and study how unreliable witnesses can be, and in what ways. [books about it]
The astronaut Frank Bormann tells a story about something that happened along the way on a trip to the moon. Someone listened to the actual recording of the incident, and found that it was drastically different from the story. He played it for Bormann--I heard this on NPR radio, by the way--and Bormann said, well, yeah, I guess so, but I'm still going to tell the story, it's so good. Imagine how many books about the moon flights, about Bormann, about space flight in general, will include this entirely wrong story as "truth".
The Fayetteville, NC newspaper had a nice report about a meeting at Methodist University (then college) where a well-known writer had given a talk. The problem is, it never happened. Weather was so bad that the meeting was called off. But the report had been "pre-written", and published as is. And a historian reading that paper 50 years from now probably will take it as fact, as truth.
Now I've said this, about the newspaper, but I'm repeating what my wife, who was then chief librarian at Methodist, told me. I wasn't actually at Methodist to see that there was no meeting, nor did I read the newspaper report as far as I can recall. So I could be wrong, eh?
Initial reports on September 11, 2001 (9/11) stated that the State Department had been bombed. Never happened. But this was in the heat of the event. The next day (IIRC), all the major broadcast TV networks reported that some people had been rescued from the rubble, found in an SUV. I checked every network, and all reported this as truth; yet the next day, all admitted that no such thing had happened.
I rarely listen to the news right after some shocking event has happened, because the report will likely have "substantial inaccuracies" in it.
But for months, even more than a year perhaps, after the destruction of the World Trade Center, the tally of dead was about 7,000. Then that was reduced to about 3,000, a number which has held up. Wikipedia now says 2,974 died as an immediate result of the attacks with another 24 missing and presumed dead. (Of course, not everything in Wikipedia is correct.) With all those resources, with the importance of who had died and who hadn't (insurance claims, government and charitable perks for the relatives of those who died), the number was drastically wrong.
Be skeptical. Try to find out where stories come from. Yes, the BBC may report that one Chinese killed another because the latter sold his "magic sword" from an MMORPG, and it MAY be true, but then again, how reliable is news from China as reported by the BBC? Yes, a South Korean may have died from failure to take care of bodily functions while playing online games--or may not. One student told me he knew someone who had to go to a hospital to be treated for malnourishment because he played video games day in an day out--and maybe that was true, or maybe not.
Just because you heard it, just because someone told you about it, just because it was in the news, doesn't mean it's true. "What everyone knows" isn't always true, though frequently it is.
If it sounds unbelievable, maybe you shouldn't believe it! "Take everything with a grain of salt". You can rely more on your personal experience than on anything else, but even THAT can be deceptive.
This is part of critical thinking critically, discussed in Wikipedia as:
"Critical thinking consists of mental processes of discernment, analysis and evaluation. It includes possible processes of reflecting upon a tangible or intangible item in order to form a solid judgment that reconciles scientific evidence with common sense. In contemporary usage "critical" has a certain negative connotation that does not apply in the present case. Though the term "analytical thinking" may seem to convey the idea more accurately, critical thinking clearly involves synthesis, evaluation, and reconstruction of thinking, in addition to analysis.
Critical thinkers gather information from all senses, verbal and/or written expressions, reflection, observation, experience and reasoning. Critical thinking has its basis in intellectual criteria that go beyond subject-matter divisions and which include: clarity, credibility, accuracy, precision, relevance, depth, breadth, logic, significance and fairness."
In some ways game design is an exercise in critical thinking! Especially as you decide how to modify a game based on playtesting input.