The first-past-the-post voting system sucks; the resulting two-party system sucks; but right now we have to operate within it

Only if you think voting is the extent of political action.

The mathematics of that system entail the simple fact that if you discourage people from keeping Trump out, you are helping get Trump in

And if you encourage getting Harris in, you are helping Harris get in, who has promised imperalism, genocide, World War 3, and failed Climate action.

That makes you a Trump supporter.

In 20 years you'll look back at yourself, if leftists have managed to prevent the end of the world, as someone who supported a fascist regime and refused to lift a finger against it. I hope you'll come to your senses much sooner than that.