The issue is that it's easy to ignore the NPCs and gank the target then leave.
I'm sure the Hit Squad could be given the means to find and pursue them.
As I've said before, the "big picture" issue is all about the C&P thing.
If it was up to me I'd set it up so that hit-squads of overpowered ships would pursue griefers relentlessly through high & medium security systems.
The only place they'd be safe would be in low security and lawless systems.
And then I'd put desirable things in the low security and lawless systems to encourage other players to venture into those systems.
The end result would be that lawless systems would be places where knows what to expect when they visit them and the rest of the galaxy would have the level of policing one might reasonably expect in a galaxy where accidentally shooting a cop or bumping into another ship can be a death sentence.