Sane people don't have excessive drama with their exes.
Sane people do not always have sane exes.
Sane people don't make accounts to troll anti-google posts. And who said anything about excessive drama: do I really need to list the myriad reasons why one wouldn't want email to automatically "follow" exes and vice versa?
Clearly this is an edge case though; you cant protect against every eventuality!