| It's probably confirmation bias. Same reason a study with positive outcomes about coffee/alcohol/gay parenthood/gender reassignment/<insert issue> are not criticized as much as a study on the same topic that had negative outcomes. We want certain things to be true so we (consciously or not) avoid criticizing studies bolstering what we want to be true and harshly criticize studies we want to be false. I like to think science always prevails in the end (like with tobacco), but it can take half a century or more to converge on the truth. |
If you have a friend group of 10 people, 4 of which regularly work out. You will probably notice that those 4 friends have less body fat and are more toned than the other 6. At that point, if a study came out saying that working out had no impact on body physique, you'd reflexively question the results.
That might sound ridiculous, but lots of people here grew up playing "violent" video games through the 90s-00s, and had large friend groups who did the same. And it's pretty likely that, for most of us, none of our friends ended up with violent or aggressive tendencies.
Anecdotes are not scientifically rigorous, but they aren't completely useless either. If violent video games caused measurable increases in aggressive behavior, people who were around a large cohort of people playing these games would notice this fact in action. Just like they'd notice that friends who eat a lot of cake tend to be larger than the one who don't.