I have no reason to defend Obama's record nor am I trying to, because it's correct. 3 million deportations. Tom Homan hired by Democrats. ICE BORTAC infrastructure built under Democratic governance. Fossil fuel expansion while blocking one pipeline as political cover. Gotta love those "bridge fuels," friggin idiots. These are real and they're damning. You're right that this isn't harm reduction but an architecture of the harm being built with a friendlier face on it.
The Nixon point is also correct. The Civil Rights Movement didn't win by electing the right people. It won by making inaction more politically costly than concession regardless of who held office. Interest convergence is the mechanism. Voting isn't.
But here's where your argument collapses into the same categorical error the image made.
You're treating "Democrat" as a fixed ideological category that determines outcomes regardless of the individual, the race, or the conditions. It's a vast generalization The Democratic Party is a ballot apparatus, not a coherent political entity. It contains Obama. It also contains the Squad. It contained the New Deal coalition and it contained the DLC that dismantled it. The Tea Party used the Republican apparatus to primary and replace establishment Republicans with candidates who were genuinely further right. That's not a hypothetical, it happened, and it reshaped the party against the establishment's will.
The candidates I'm talking about are being spent against by both establishment Democrats and Republicans simultaneously. Their own party's apparatus is trying to stop them. Calling that "voting for Democrats" in the sense you mean requires ignoring everything specific about the race in favor of the label on the ballot line.
You've correctly identified that the Democratic establishment produces harm. We have 0 argument there. Both establiahments are fascist. You haven't demonstrated that everyone who uses the Democratic ballot line to run against that establishment is equivalent to Obama. That's the gap in your argument. And until you close it, the interest convergence point, which is correct, doesn't rule out supporting candidates who are themselves creating the political pressure you're describing as the only thing that works. And until we've reached a point, as you mentioned it would have to be incremental under our existing system, to educate voters and provide them with more options to better represent them, what more can we do? We're attempting to do the work that we can while we can, but that still exists under the same system. If voting is advocating for genocide, then what is participation in our capitalist society? Our taxes fund the actions of the government and our labor helps corporations to gain their capital and influence, but we still work as we need our own capital to survive, protect each other, and organize.
I'm not saying don't advocate for better, don't build alternatives to capitalism, don't prepare for the revolution. I'm saying do that in addition to making sure the fascist don't have the easiest time at the voting booth as well. Make them have to rig it, the thing we can nearly bet on is their incompetence, and that will add more fuel to the fire in people's eyes to overthrow this system. Unfortunately, our system exists such that most voters remain ignorant, lack education, and are propagandized to be selfish. I'm just saying to be strategic about it to make it easier for us in the long run. Play the longer game so we can actually fix this shit instead of putting a bandaid on it.