Internet memes are a symptom instead of the cause of all the things happening in the world, good or bad. People meme about stuff they experience and those who feel the same way like the memes. Generalising the whole meme culture is just like saying nostr is bad because anyone can post anything, even illegal stuff. While some people may use nostr to do that, most of don’t. Same with memes.
Discussion
I don't believe this analogy is operative at all. I have already conceded that not all memes are bad. I also support nuclear power, even though nuclear technology can be used for bad, too. Your analogy is really just a straw man, as conceived.
Just wanted to explain that the memes you describe come around because they are a symptom of a partly dysfunctional society - people often use humour as a defence mechanism in difficult situations. Memes don’t create “bad” ideas, they portray them.
Appearance of Nostr is also a symptom of mass censorship. It’s the product of the people that resist that censorship. If we go with your process of thinking, Nostr would be the reason for censorship. That’s not the case.