Funny thing is something similar occurs in lab mice. Where a technician is selecting a mouse for cull the more aggressive mice are more likely to be the ones selected. Problem mice who kill their littermates can ruin experiments.
My best guess is that the short snout trait is in linkage with something else that is actually what is being selected upon. At least for racoons.
https://www.scientificamerican.com/article/raccoons-are-show...
Something something autodomestication...
The guy who kills a family for fun is more aggressive than the guy who execute him. I'm not even sure how you could get to any other conclusion
They also refuse to eat in the trash bins of anybody that drink Cappuccino after 01:00pm in a sign of integration.
Maybe it's just that many of the large aggressive bears living near villages have just been shot or scared away, but the genetics is unchanged and the offspring of large aggressive bears currently living away from villages will have no aversion to trying their luck in the village ?
If there's a range of "how aggressive a bear can be", and it's mostly driven by genetics, and aggression is heavily selected against in the environment? Then you can get a considerable reduction in aggression in the span of as little as a few generations. Bear generation time is what, 5 years? They coexisted with humans for a long time now.
Now, traits with weaker genetic components (i.e. if bear aggression is only 50% genetic) can take much longer. Even more so for traits with low variance, or highly complex traits and behaviors. But evolution isn't always slow. Certain changes can happen quickly - about as quickly as you can apply the selection pressure.