Why is the Bitcoin subreddit so religious about the currency?

They literally say nothing negative about it, and people who do, get downvoted to oblivion. Isn't it an objective truth, there are some alt-coins out there, that do what Bitcoin was originally intended to do, but better? Like Monero, Higher privacy, low fees and fast transactions, more decentralized because of how it's mined and quite a bit more stable. A lot of the Alt-coins are garbage, though, I agree, and idk how why need literal thousands of Crypto currencies that essentially do the same, with a few exceptions like Ethereum.