Because it isn't about actions, it is about sides. Tribalism.

It is the loss of complexity. Many cannot understand that by choosing the lesser of two evils does not mean you support evil. It means your choices are limited. We have turned the political issues into good and evil, rather than disagreements in how to achieve our mostly shared goals. We can no longer see the other side as friends and family, creating a self-fulfilling prophecy.

Anyone countering this can just proclaim "both sides" and in some sense they will be right, they have evidence and people do abuse that framework. But at the same time that destroys the bridge between us. The abuse of calling both sides evil along with the accusation that all use cases are instances of abuse. It binarizes the environment, creating a simple world where there are only two choices. Which is easy to do when everything is so complex, as we're so tired and don't want to think.

It's also why this administration's strategy is so effective: overload the opposition. After all, Brandolini's Law states: "The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it." They've weaponized it. It's an effective strategy, and hard to defend against. I'm sure someone will offer a solution, "it's so simple, you just..." and we perpetuate the game.