Actually the process is behavioral selection via culling.  What happens is only the most timid bears survive.  Nothing really new about this.  It's been going on pretty much since feral Europeans first arrived here.

But it does seem that under less pressure of this kind, such as when bears enjoy better protection, some slowly overcome being timid.  I can live with that.

Reason is I was once stalked for about a half-hour by an adult brown bear in Yakutat that, although it never allowed me to get a look at it through its screen of brush, made sufficient noise as it followed me back to my car that I resolved to never again go anywhere in bear country where I didn't have a good field of vision from a long way off--and to remain vigilant at all times when I did.

Several people have been badly mauled by doing something stupid like obliviously jogging through parks frequented by bears while listening to their ear-buds.  That's kind of asking for it.  Alaska isn't Disneyland.