These leftist politicians don't understand psychology, they don't understand how to project power, they don't understand you need to use power.

Nor do they understand the degree of ruthlessness you have to have to be willing to really and truly project your power. We've not had a democrat politician in the White House since L. B. Freaking J. who understood that.

At their core, Clinton, Obama and Biden were content to beat on either weak or politically expedient foes. None of those men had the intestinal fortitude to do anything of substance during their tenures when there was the slightest risk of political blowback or unpopularity.

Clinton let Somali clans butcher US troops and Bin Laden run wild because he was listening to his lawyers and his incompetent (multiple SecDefs) who told him not to escalate.
Obama pulled us out of Iraq, allowed ISIS to flourish, hamstrung us in Afghanistan, told Medvedev to tell Putin he'd have "flexibility" after his election.
Biden did the stuff you mentioned and was generally brain dead.

LBJ, for his flaws, understood that enemies were things you dealt with.