There's a certain type of person that is actually willing to shrink the pie as long as they get the largest part of it. You can criticise neoliberals for a lot (and you should), but their stated goal was to grow the economy and lift all boats that way. Obviously they ended up creating a system where most boats had holes in them, but they did lift the tide.
Trump is going to shrink the world economy, but him and his friends will end up owning an even bigger part (percentage wise) of US assets than anyone before. It's basically going to turn into post-communist Russia. Trump is the Yeltsin figure, the American Putin is waiting in the wings somewhere.
They have nukes and military bases everywhere, it'll affect everyone, there's no way the mess stays contained within the US.