This might be a stupid idea but that has never stopped me before.
How about, just as you sign up for one of the PP mob, you could sign up, or more accurately declare, that you are a pirate. You could do this instantly but it would take a time period (say 24 hours) for you to be able to opt out, or rather, you can opt out straight away but your status as a pirate remains for a longer period.
So as a noob, I fly into a system and I immediately get a warning (much like the Mission objective message you get) to say, warning, pirates are operating in this area. I could immediately make plans to get out of there. Straight away, the noob has escaped.
Let's say I get the warning and decide I will take my chances. Maybe the pirate kills me. Tough, he was labelled as such. Maybe it wasn't a pirate but a griefer/ganker posing? Well, same applies, you had your warning, you lost your chance.
Yeah? I hear you ask, why would a griefer/ganker announce to the world that they're a pirate? Well, what if under the label 'pirate' you had the right to just kill anything you found, no comeback but an undeclared ship killing someone does have comeback. Obviously there are exemptions. Faction against faction. Victim actually had a bounty on them. Consequences for a straight out, unsolicited kill, could be punishment such as a fine or a 'time-out' ban.
I feel this would give a player in open to do a [insert gif of Abe Simpson waking in and out of door] option if there are pirates in the area. Those willing to take their chances have by proxy of remaining, declared their acceptance of their situation.