It's not Trump that will be the "warmonger", it's the people he empowers. Trump is a shallow personality -- all he wants is attention, he does not have an ideology. For the boring part of actually enacting policy he defers to supplicants and this time around his supplicants are more unserious and self-interested than the first time around.
This is just basic 2nd order reasoning that it seems like so many people in this country lack.