The American taxpayer doesn't get to choose where their taxes go, so they can't be responsible for atrocities caused by that money. Joe Biden is the president; I understand that there are checks and balances that prevent him from making wild changes out of left field, but he definitely has the power to stop sending weapons to a country he himself has said has gone too far. Would that decision have repercussions for himself and the population at large? Of course. Would those repercussions be significant enough to warrant continuing to massacre innocent people to avoid them? Fuck no.
The fact that Biden chooses not to make that stand is damning, even if he's still the candidate I'll be voting for to prevent the worst outcome. In the end, Biden's choices demand that action be taken by the population, and that action will need to be more than just waiting 4 years and hoping the next candidate isn't as bad; real efforts rivaling the civil rights movement will need to be taken in order to push our government back toward being acceptable again by the time we're voting in new candidates.
That sucks, bud. I hope your future love makes their way to your living room eventually!