I think that other countries will happily explore the AI topic further, independent from the US. Regarding stupidity and hope, see how well we're doing with climate change, or environmental regulations.
I think instead of being pessimistic about the inevitability of disasters, we should try and prevent them. We're doing better than nothing about climate change, and we can keep trying to do more even though the damage is already great.
I think these are separate concerns. On one hand, yes, we should try to do what we can. On the other, when talking about things like AI development, we shouldn't be as naive to expect that everyone will play nice.