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 dunno the ins and outs of wiki infighting, but I don’t think one person should have control over whether hundreds of comments get seen or not. Unfortunate if people can quote things that put you in a bad light but unless things are taken out of context maybe just think harder about what you post in the first place.