> When the US is a rogue, isolated idiocracy

This reads like wishful thinking from a butthurt European. I am not a fan of many of Trump's policies and I think ex-US investor sentiment has definitely soured. But it's not like the USA is now DPRK.

> how much of that money do you think will flow to the US?

If there's one thing you can be sure of about aggregate investor behavior, it's that investors seek good risk-adjusted returns regardless of any moral or political objections.

So long as capital flows remain unimpeded, property rights are respected, and US companies have good expected future returns, investors' money will continue to flow in to the US.