Exactly. People act like if the US steps back there will suddenly be peace and everyone will get along. What will happen is someone else will step into the US position or multiple someone’s will fight for that position. Neither are probably good for the US or the world.
Another problem (which Trump is idiotically pushing) is for everyone else to grow their military. Do we really think the world is safer with more countries having larger militaries that are an election or coup away from no longer being allies?