It's not about "encouraging Dems to improve". They won't. It's about giving up on a broken system. Why would you keep doing something over and over again, knowing that it isn't working? Or, knowing that it's working against you? It's insane to expect constant support from people that you consistently reject.

Some people will never give up trying. Other people aren't going to bother after enough failed attempts. That number is only going to keep getting worse as time goes on, and nothing changes.

And the vaccine analogy is probably better if you think about it like this...some people will get the real vaccine, while most people will get a placebo that does nothing to help them, and others still will get a poison shot that makes them sick. You can never tell what you're going to get, until after you take it.

The Democratic party is rotten. It is mostly ineffective and occasionally toxic. The fact that there are a few good people in there, trying to make things better for the rest of us, doesn't matter. Those people will never have enough votes to overrule the ones that either aren't willing to help, or are actively working against us. And even when someone seems to be on your side, as soon as they get elected, they turn out to be no better than the average Republican. (Looking at folks like John Fetterman)