That's where I disagree with people about Trump.Global demilitarisation is a goal for sure, and it can be done, but it is a process that happens as part of a wider mutual socialist, internationalist project. Shock actions by Trump are never going to be part of "long-held goals of the left"
I think good things are often done by bad people. Individuals are tools in the hands of the Zeitgeist, which frequently produces outcomes opposite to their conscious intentions. Trump doesn't intend to bring about the end of the American Empire, but he may well end up doing so.