Well I suppose this is a humorus allusion to the Stalone movie but it is an interesting question.
I have yet to read what set Frein against police.
He has a criminal history. Years of petty theft from war re-enactment vendors, finally caught in 2004 and charged when he stupidly tried to resell items on ebay, then friend ratted him out. Failed to appear in court, became fugitive from justice in NY and PA, hid out in the same woods he is in now for several days before father convinced him to turn himself in, served approximately 3 months in prison....
http://citizensvoice.com/news/frein-fled-earlier-prosecution-on-theft-charges-1.1763202