I have worked with many Americans, so I understand the relationship. I'll be back out there working in August if the COVID threat allows.
The American people (in general) are not the problem. The problem is Trump, and the current bunch of sycophants that surround him, and the generals who fear him. If you know anything about Trump, you will know how dangerous he can be. The more cornered he feels, the more likely he'll be to lash out. I'm pretty sure the US/UK will ever come to blows; certainly not in my lifetime, but it's what we could potentially get dragged into that worries me.