There are some really disgusting xenophobic comments on this thread, including not liking the US because it's full of Americans, and listing (without any hint of irony) both fat people and ignorance as reasons not to move.
OP, I have lived in the US for 30 years and I have never even heard of an armed intruder entering someone's home. That's just not a thing. In fact I hear a lot more about burglaries in the UK than here.
Yes, the school shootings we have had have been horrendous, although thankfully rare. Of course it's a concern for parents, but so are the many other tragic and more likely things that could happen to our kids when they are at school for the day. I wish we had stricter gun laws, but in 30 years the only guns I have ever seen have been those carried by police officers.
The inequality in health care is awful. But I assume that wouldn't personally affect you, as it doesn't me, because your husband would be given good coverage with his job. (But, of course, check that that's the case.) I can choose to see specialists for any concerns I have, with usually very little wait for an appointment. Preventative care and vaccines are free and widely available.
Guess what? My local supermarket carries a wide range of fruit and vegetables, as well as products made with whole grains, etc. I don't know where the misconception comes from that the food here is awful. Supermarket food is more expensive than in the UK, and eating out tends to be cheaper, but we have a wide choice with many healthy options both when shopping at the supermarket and when we do eat out.
Public transportation isn't always great, depending on where you are. Where I live unfortunately it's virtually non-existent, so we do have to drive a lot to get most places. But there are pavements and bike lanes everywhere and me and everyone I know stays active - walking, jogging, biking, swimming, playing tennis, etc.
I'm also confused as to where the notion that our education system is behind the UK's comes from. My children, who are now grown, went through the education system here, and got a far better and more well rounded education than I did in the UK.
You are right to consider all the pluses and minuses, OP, but please don't listen to the ignorant posters on this thread who give reasons such as "fat people" as reasons not to make the move, and maybe look into some stats on things that concern you such as home invasions, to put your mind at ease.