The image is rhetorically effective and philosophically wrong.
It assumes lesser evil voting has no terminal conditions. That's a strawman. The argument isn't "accept any amount of evil indefinitely." It's "while building the capacity to break the system, slow the accumulation of harm so there are more people alive and organized to do the breaking." Those are different positions and collapsing them is how the image works as rhetoric. It's also ideologically similar to how conservatives collapse Democrats, liberals, and leftists together. I'd hope you're more intelligent than that.
The death camp math also proves too much. By that logic, if one candidate builds 50 death camps and the other builds 51, destroying one death camp is also pointless because you've implicitly accepted the existence of 49 others. The logic rules out every incremental action including the organizing you're telling us to do instead. If no action that reduces harm without eliminating it is acceptable, there is no acceptable action short of immediate revolution. Which, I would ask, what was Lenin's view on immediate revolution and the monopoly on violence?
I already said there shouldn't be any death camps. Obviously. The question is whether 50 is the same as 51 to the people in them. I'd ask the people in them. I suspect they have a view.
I'm also not voting for genocidaires. I'm voting for the candidates both establishment Democrats and Republicans are spending money to stop, who are explicitly calling out both parties, and who have policy that directly counters what's producing the conditions you're describing. Collapsing that into "sheepherding for fascist Ds" requires ignoring everything specific about the races in favor of a general theory that conveniently rules out every available action.
Organize. Advocate. Build alternatives. Vote strategically where it matters. These aren't contradictions. You've decided they are because it's cleaner that way and you don't have to face an uncomfortability that way. That's exactly how MAGA operates ideologically.