What we have with imperialism in the US is not a collective hivemind. It's several members of the ruling class all pushing for their own agendas with these wars, as they are connected with the fossil fuel industries and private war industry. It's not as simple as it seems.

Trump is still managing to push the war machine despite some of the decisions that make some of them pissy. We still have an insanely bloated military budget and the war industry hasn't really been cut down.