Gmail allows for dot address matching. This is a *huge* problem that has never been addressed.
It hasn't been addressed because there is no such problem. All of the incidents described in the link you provided, as well as your own experience, seem to be explained by user stupidity. No need to invent some mysterious google-bug in order to explain it.
I had a similar experience; some idiot used my google email address, with a dot in the middle (no dot in mine), as his recovery e-mail for a bunch of his other accounts. So I kept getting periodic emails letting me know when he's signed in from a new location. Confused the shit out of me at first. After I contacted him to let him know about it, it turned out he was misspelling his own e-mail address.
When the choice is between user stupidity and a systemic problem, always pick user stupidity.
Stories like this scare the shit out of me because, at any time, if one of those people I happen to receive email for suddenly decides to go into full-creep mode, I could be put in prison for a very, very long time.
Nonsense. If this were true, any pissed off person who knows your e-mail address could get your arrested by spamming you with kiddie-porn from an anonymous e-mail provider. You're not going to go to jail just for receiving e-mail.