The people you want to blame aren’t here in a politics community. Maybe a few posters here did a protest vote, probably in a safe state where it didn’t matter, but most people here voted. The people who didn’t vote (in numbers meaningful to winning) weren’t sitting down to think about what the world would be like in each outcome and then saying “eh, it’s fine either way”, they were marginal voters who just didn’t really think it was important because politicians either don’t care about them or don’t follow through on promises. They’re just going to check out when you call them or the other politician names, because it’s a tiring endeavor that they don’t care about. You definitely have people in your life that say “they’re not political” and check out as soon as politics is brought up. You’re never going to reach those voters by expressing your disdain in a forum for politically engaged people, the only way to get to them is to actually motivate them to vote en masse with legit campaigns to inspire them that their lives will get better if they take this action.
Because their personal motivations are not “maximize the chances for a Democratic win”, but preserve the power of themselves and their allies with money and influence. If these policies become a centerpiece of the election and broadly popularized, it becomes dangerous to ignore it and advances the saliency regardless of the outcome, pushing it closer to someone actually doing it. A campaign that says “the rich are abusing workers to fill their pockets and the government should tax their wealth until there are no billionaires and provide benefits to the workers” is dangerous to the rich people, even if its initially proposed by someone with no intention of following through.