... He started no new hostile military actions, which is the point. ...
He cancelled for example the INF treaty. Result: Russia will fire now intercontinental rockets directly to the USA in case someone fires an intermediate range rocket from direction Europe to Russia. A better way in this context would had been, if he had tried to bring China into this treaty too.
IOW, he started no new military actions. ...
You don't call it a military action to cancel disarmament treaties? Donald Trump tries to bring the Iran for example into a helpless situation, so the Iran has politically (and economically) nothing to lose any longer. The end of politics means war. So why was the man, who respects no values except the value "don't get caught", doing such a bullshit - if not on military reasons and to threaten others with the weapons of the USA to do his own personal will - against the agreements the USA had done together with the best allies of the USA?
Do you really think the political stupidities Donald Trump had done in context security architecture of the world had minimized the dangers of terror for the citizens of the USA?
Or did Donald Trump not bring his personal terror directly into the Capitol - while the armed forces there partially supported his criminal attitudes by doing nothing to help this democratic institution of the USA - while their comrades died for? What is any longer clear in the USA? What for heavens sake made this extremist criminal idiot out of your country? What do you see when you take a look in the mirror? An US-American? Proud? Brave? Free? On good reasons member of a great nation, whatever this might be? Donald Trump made the republican to cowards with his terror against themselve, isn't it? And because they were cowards such things were able to happen.