My friend, what you wrote totally ignores the passage of time. Everything you wrote is true if we only look at one election, and none of it is true if we consider the passage of time and how pressure operates. If the political party is not getting votes, if all of their candidates are losing, either they will disband or they will find different policies to push.
I think you’re missing several things. First, if the phenomenon is accurate, and it is, then the burden is on you to figure out how to stop getting played. Don’t ask other people to solve your problems. Recognize your problems, and then work to solve them directly.
Second, the spoiler effect doesn’t exist unless you’re in a swing state. But how many Americans were told that they have to vote for Harris or they’re supporting Trump, when in fact their state was nowhere close to 50/50 so realistically they could have voted for anyone?
Third, there is no single leftist community. There are many different leftist communities that overlap and agree on various points. Also, you’re suggesting that leftists are idealist, but that’s not the truth. We all recognize the current situation, and we’re trying to make a better one, but you’re not. In other words, your cynicism has caused you to throw in the towel, and to accept the current reality as permanent, unchangeable, it sucks but there’s nothing you can do, and that’s certainly true if you believe it.