This is one of the reasons I cannot be a right-winger. Right-wingers are always the ones who will advance the argument that if the president threatens force, he must use lest he make us "look weak." If I understand this rationale, I guess it means if Trump makes even more outrageous threats, we're obliged to follow through on them. That's a great idea.
I have a theory. My theory's been that regardless whom is president and regardless what he says or does, our enemies act as they wish, knowing all along our military capabilities and the chance that any president, at any time, may use it against them. This is based on my observation of various regimes across decades and across many presidencies.