This post in particular probably won't cause a wide swing in support, but it will cause a few people to reconsider past beliefs. This might get those people thinking if it was really OK to make fun of the attack on Pelosis husband, and then that might get them to reconsider how they look at Jan 6.
Rising grocery bills will flip more people than this, of course
I'm not saying that the people who change their minds now are good people (I don't think anyone thinks this) but we need everyone we can get (WITHOUT compromising our core values) when it comes to opposing trump. Every time he fucks up, we need to put the pressure on. Cult deprogramming is difficult, and can't be done for everyone, but it is possible.
There is only one person you are helping when you preach defeatism and give up early.
At this point, the difference is mostly in stability. It's highly unlikely that Harris would have slapped a bunch of tarrifs around willy nilly, and she probably wouldn't be blowing up a bunch of ships near Venezuela (I wouldn't rule it out, but I would assume that the false flag operation would be more subtle).
US voting is 100% picking the lesser evil, at least for now. The current hope would be that democratic socialists gain enough standing to take over the democratic party, so that voters have meaningful choice. In an ideal world, we'd repeal things like citizens united as well