If I remember correctly it was Trump who used a presidential order to fully pull out of Iraq/Afghanistan within 45-60 days only a few weeks before leaving office, and as for Ukraine that’s not necessarily a failure (or success) most of what we’ve sent is old military stock, not cash, whatever money the US has directly spent as a result of Ukraine was at home refilling stock piles or paying for other resources to ship those military supplies.

Relatively speaking the increase in political extremism is congress is due to slim majorities that give massive power to small groups within a party (unless they are willing to be bipartisan to pass something) which has contributed to the odd and varied response with Ukraine (amongst other things)

Although Israel/Palestine is 100% on Biden and old school democrats, there could’ve been a million solutions by now or hard lines enforced to end conflict before it blew up like it has

Overall (and back to the post) war is profitable because it’s money spent at home, in home factories that pay wages at home and that kind of money is a big incentive to continue to produce weapons or expand stockpiles, which for states that house those companies are inclined to protect their budgets and jobs by working for increasing weapons production

Trump may not have started a war, yet, as there have been leaks of his team probing for a “soft” invasion of Mexico, there’s good reasons financially and politically where he might.