There’s no incentive for them to change course now.
If people say: “Stop the genocide, or we will not vote you” there is plenty of incentive to change course now. But people arguing the opposite, claiming it is pointless and that the people have no power are diminishing the power of the people. This is why the DNC is pushing this narrative so heavily. They want you to be demotivated and feeling powerless. It is the same strategy like with the oil companies and climate change.