Why would you (could you) not expect this to happen? I know the expression "This is why we can't have nice things" is trite and cliche, but every "good" thing

Why would you (could you) not expect this to happen? I know the expression "This is why we can't have nice things" is trite and cliche, but every "good" thing I've seen online for over 40 years attracts parasites (depending on your definition of parasite). (Some of them are quite clever, ... so it makes me wonder why they don't point their genius at more positive activities...)