I care because, after it is all said and done, all lives do matter to me. When I read that 46% of Republicans surveyed said they planned to not take the vaccine, I think back to when I was in elementary school in the 1950s and the Polio Vaccine was rolled out. If any politician had riled up his base to the extent that 46% of his party refused that shot, Polio might still be a scourge, instead of being virtually wiped out, thanks in no small part to the Rotary Club International.
We should be fighting the Vaccine, not each other. This meme was intended to insult and provoke people on the right. It is intended to get people talking, in the hope that some will see that they are hurting themselves and those close to them, first and foremost, and not "winning."