This is the main reason I check (usually daily when possible) all the changes made to profiles I manage. Most of the time the changes made in error have been inadvertent, but occasionally I find someone making changes without really knowing what they're doing, or paying little attention. I do point out their errors, and try very hard to be diplomatic. But it's sometimes difficult.
Bottom line: keep a close eye on changes made to profiles you manage, hoping to nip things in the bud.