Because the democrats might just want to win enough to stop arming a genocide. If we…I don’t know…anti genocide holdouts or whatever…don’t vote, then we can give the democrats something they want. If we vote blue no matter who, why would the democrats change?

The people with power are also in a struggle with each other, democrats and republicans are one of the main embodiments of that struggle. The democrats might decide that they’re willing to deign to stop arming a genocide if it helps them beat the republicans.