I think to some degree the problem is a combo of some overestimating among part of the population (driven in part by recall of actual historical crime rates, and by anti-"blue"-city news media) of how dangerous big cities are, but also a
huge failure to appreciate how dangerous lots of non-big-city places in the US are. It's not entirely that big US cities are necessarily super-safe (they're largely not, if you compare to international peers) but that lots of non-big-city parts of the US are shockingly dangerous, including many parts that folks don't expect to be.
> Where I live now people truly do not lock their doors. Most garage doors in my neighborhood stay open 24/7.
Rich suburban and small towns—and I mean where the whole area's kinda rich, not just a few neighborhoods—are in fact the sort of safe that lots of people incorrectly assume all suburbs and small towns are. I know how it is, I (now) live in one of those too, so Manhattan is in-fact more dangerous than where I am (these days). :-)
Like, my kid's neurologist lives just up our street and there's a country club every half mile, it seems like. Yeah, this particular place is quite safe. Go figure, if there's vanishingly little poverty around there's also very little violent crime. But lots of US suburbs, rural towns, small suburban towns, and smaller cities are really, really poor and there doesn't (any more? Maybe ever?) seem to be some kind of aw-shucks folksiness of attitude that effectively counters the effects of that—they're just as crime-ridden and dangerous as you'd expect, from the poverty stats.