No. Not only that it doesn’t make you a bad person. IMHO, it’s far more effective than being active here.
Your not changing votes here. Sure some may say they won’t vote or they will vote third party. But like 95+% of lemmy is some version of left leaning. It’s basically a forum of people enjoying agreeing with each other (for the pillars, not the specifics). I don’t think there is anything wrong with that but imo your not making the world a better place.
I would go as far as to say this is the biggest problem with polarization today. You can’t solve it without having some communication. Imo right leaning spaces are full of misguided anger that can be used for good.