Probably his best defence is the fact that it's really unlikely that the attackers would ever swear a complaint or testify. Kind of a "robbing drug dealers problem". I'd be more worried about being targeted by a massive DDOS.
They have a term for that, its "vexatious litigant." If you do this enough, the court generally makes it hard to get counsel, will make you get your lawsuits approved by a judge ahead of time, and more.
