I've always thought this, given the number of people the tabloids monster who are pretty wealthy people.
Hire some good professional security people. Pick two or three offending journalists, sub-editors etc. Have your people follow/bin-scavenge/rake all over their lives/pay people for into, turn up their mistresses, visits to prostitutes who run a spanking dungeon, association with shady criminals, the exchange with their coke-dealer, their fiddled expenses, rolling into their car obviously drunk, then put it all on Youtube and print off photos and deliver them to their spouse and everyone on their street, and provide evidence of anything criminal to the police. Pick another two or three, rinse, repeat.
If you'd been done over by them, it would feel like great sport.