If you're sad about it beyond just a "reminder of how bad things are," then that means one or both of two things.

1. You must have harbored some kind of small belief that US electoralism could facilitate anyone other than a ghoul at the level of the presidency. Even if you think electoralism is good and cool, this isn't even electoralism. This is a VP pick. No mass movement is going to decide that. Biden (or more accurately whatever ghouls around him) decide that. This brings us to 2.

2. You must have harbored some notion that Biden could be swayed into adopting your positions. This one is vastly more stupid that #1. Stop believing in these people or that pressure works on them. Biden is bad, he will always be bad.

Keep your eyes on the fucking prize. Both the doomer shit and the weird "this is reminding me how bad things are..." shit aren't helpful. We knew this was happening. Did we all just forget Biden is bad? Like come the fuck on.

Yeah, Biden's a capitalist ghoul who benefits capitalists and was selected by capitalists. He's not for you. Whoever he picks would never be for you. Don't delude yourself. The fight is as much with him as it is with all the other capitalist ghouls.

Tl;dr: stop trying to pressure these people to be what you want them to be and actively fight them.