One problem is the "Teddy Roosevelt" syndrome.

TR said "Talk softly and carry a big stick"

To put it in 'cartoon terms'

The USA 'know' that they mean well.

America's allies can hear the soothing words and feel they can trust the US.

Some friendly states can't hear but hope the US can be trusted

But some states are further out and just see a muttering giant with a club.

As I say, just a cartoon like example, but it may help.

As for why there are hostile relations between any two states? As has been said - events and the perceived view of a society.

W