It is easy to observe how under Obama, the allegedly anti-war candidate pivoted to supporting invasions. He forgive his predecessor's use of torture. He said incoming administrations shouldn't prosecute the previous. The only gift he didn't grant was the wish to invade Iran.
There is a sense that the defense, foreign policy and intelligence establishment will have their way regardless of electoral outcomes. Trump's first term was unique in that he did not start any new wars. Permanent Washington sought to actively sabotage his administration. Many infer a correlation between the two observations.
As for the assertion that, "If we don't spend x amount of dollars or intervene, the world will devolve into WWIII", I'm not sold on this doom. We might equally ask, If the US continues to misallocate resources via uncontrolled spending, will we have a functional economy capable of fielding a meaningful military response?