The point is "ignoring dots" doesn't lead to "constantly getting e-mail for other people" (because there are no other people that own the "dotted" version of the email).
It does though. My gmail account has a dot. For some reason someone with a similar name to mine must have for believed his address was the non dotted version of mine and to this day I keep getting emails addressed to this other person... and yes, it is a real person who I've managed to contact.
The point is that without the dots rule I'd never get those emails, and the senders would get their message bounced back right away.
The point is that without the dots rule I'd never get those emails, and the senders would get their message bounced back right away.