YABU and irrational. I'm British and I live in the US at the moment.
Health insurance - if you have proper health insurance it's fabulous. My maternity care has been absolutely exceptional. My friends in the UK having babies have had nothing close to the kind of care I have had. I have an OBGYN on call who I can WhatsApp with any questions. Any kind of weird /concerning symptoms, and I get seen that afternoon! We went home to the UK at 20 weeks for a visit and I had to go to A&E for a blood clot. It was a horrific experience and a real eye opener.
Guns - especially in Connecticut, very low chance of anything happening.
You don't have Europe at your doorstep for holidays but you have quite a lot of places to visit and you also have the National parks- absolutely exceptional. Nothing in Europe compares to the vastness of US national parks. We have had some exceptional holidays in the US. You are also very close to South America and we've had some great holidays we wouldn't have taken from Europe.
I have found Americans to be friendly, open and a lot more educated than we give them credit for. Especially on the East Coast, people are quite moderate in their politics. That said, I have not met more friendly and welcoming people than in the South!
Home sickness / distance - yes, that's an issue and for you to judge.
Your job/prospects is what you need to worry about. DP and I came here with jobs lined up for both of us. Leave is not as good (20 weeks paid mat leave for me and that's generous).
It's not forever. It's about the opportunity and the new experiences. But if you're so ignorant to begin with, you would probably not appreciate it.