You’re not on “Lemmy”. Your a pawb.social user on a Lemmy.ml community. Lemmy.ml is not Lemmy. Lemmy.ml is an Lemmy instance (just like pawb.social.) The purpose of the Lemmy.ml instance is for communists to come together to talk communist shit. The memes community within Lemmy.ml therefore is an absolutely perfect place for them to post left-wing memes. If you want to see memes by and for a general purpose audience then hang out at at Lemmy.world memes community. It’s not Lemmy.ml user’s fault you think they are a general purpose Lemmy instance like Lemmy.world is. That’s your fault and the solution is for you to make an effort to find the spaces that serve your needs not to pick random spaces and tell them they are doing it wrong for not alligning to your incorrect expectations.