Some accounts are deleting their posts after a few downvotes. It’s devastating on communities like c/asklemmy.
Lemmy doesn’t track an account’s karma like reddit. So, all downvotes will be isolated to your post or comment and won’t affect your account—unless you wrote something truly horrible.
Remember lemmy is a community effort. Deleting a post also removes all comments on it. So you are not only robbing the effort others put in, you are actively removing knowledge from the fediverse. Others won’t be able to find it through search and lemmy will seem lonelier than it already is.
I don’t know that it is “not the point”. I’m sure there are varied expectations, and I don’t think there are clearly defined rules of what an up or down vote means exactly, but it seems they are generally accepted to be “this is a good post/comment” or “this is a bad post/comment”. I think you just got downvoted because you had a bad take. That’s OK. Shit happens.