If you skip your daughter’s cello recital to do big-time lawyer stuff, some CIA-trained psychopath is going to kill half of Philadelphia. That is the main lesson to be learned from “Law Abiding Citizen”(2009), in which Jamie Foxx is the big-time lawyer and Gerard Butler is the CIA-trained psychopath. I might be oversimplifying. I was too caught up in all the big, sloppy revenge Butler was taking on an American legal system that promotes expediency over justice (I am a long-time fan of big, sloppy revenge). If the sloppiness makes you feel guilty, the ending will bail you out.