You've read too much "weird" stuff. You can walk anywhere except the "bad" parts of the big cities, just like the UK. Literally hundreds/thousands of miles of "nice" safe countryside, shore lines, etc. Gun crime, again, only a problem in the "bad" parts of the big cities. Yes, long drives if you want to go state to state, but at least roads are exceptionally good on the inter-states.
Have you ever been? If so, surely you saw the reality not the biased social media??
I've had numerous clients emigrate there, a few friends/relatives who've moved there, and literally none have come back - all seemingly happy there.
I've been on holiday a few times and would love to keep going back and exploring new states. Never felt particularly threatened most of the time. Though once we ended up in a KFC in a "bad" downtown area and didn't realise it. We'd gone in, ordered, picked up our food, sat down, before we looked around and noticed quite a few "dodgy" characters staring at us and then realised there were no other "holidaymakers" in there. Yes, for a short while we felt apprehensive, but we also noticed the staff behind the counter watching and a couple of the servers came over to "clean" the tables around where we sat, they didn't say anything, but I think they'd deliberately come over to look out for us had we been approached. Anyway we ate our meal, pretty quickly, and left. No harm done. No different to finding ourselves in the "wrong" part of town in other places abroad, such as Jamaica, Kenya, Egypt, and even in the "wrong" part of town in some UK cities.
The US is a huge place, many individual states bigger than the UK, so it's inevitable some places are nicer than others, just like any country, likewise a massive variation in people too, most of whom are a lot more happy, helpful and friendly than in some other countries.