The law is the law. This is not a case of entrapment this is people committing illegal and nasty acts in public. Should crimes be ignored while the war on terror goes on? (Then I'll be over to rob your house later.)
And Strawbridges (Center City) was a nice place at one time- I have not been there is quite a while- there was a monorail (no puns please) that kids could ride in the store among other things.
Your example is the exactly the problem. I COULD be at your house in Philly to rob it this afternoon, after e-mailing you my intention to do it, and providing information on exactly where I intended to fence your stuff and the Philly cops STILL wouldn't solve your burglary.
With such poor performance on ordinary crime, it is perfectly reasonable to question the priorities here.