That's a false equivalency. Destroying a concentration camp doesn't put anyone into a position of power. It's incremental, yes, but it's fundamentally anti-fascist. Voting in Democrats, when literally 100 off them voted for more ICE, when Obama and Clinton turned Libya into an open-air slave market, when Obama hired Tom Homan and created the conditions for ICE BORTAC to be used in major cities, when Obama and Homan deported 3m people, double what Trump has managed do in both terms so far... That's not incremental harm reduction. That's literally voting for harm. It would be the equivalent of making sure there were social workers at the concentration camps, or demanding we send the prisoners art supplies. It's not actually incrementalization of anything. It's just a feel-good veneer on atrocity.
Honestly, there's so few examples of presidents that didn't preside over total fucking atrocities that maybe we're coming at this from different places. I am coming at it from the USA is a fundamental violent, white supremacist, misogynistic, genocidal, enslaving, and mass murdering entity and it has been since day 1. There's no harm reduction through voting here. People like to point at Obama's blocking of Keystone XL as an example of harm reduction but ignore the fact that he expanded domestic fossil fuel production more than any other president. Was blocking the Keystone XL harm reduction? No. It was appeasement. There's a huge difference.
Similarly, people like to say that civil rights wouldn't have gone anywhere if Ds weren't in charge, but Nixon was forced by the civil rights movement to make policy concessions, just the Ds were. This is the only thing that works. Forcing them to appease. You want harm reduction, you're going to have to create interest convergence, and voting doesn't do that.