Perhaps in the light of these protests, the rise in shoplifting (not connected) and the fact that a shopkeeper was told to take down a poster calling shoplifters scumbags, as it may cause offense, shopkeepers could take teh following approach
1. Find some palestine action flags, and make one side sticky with glue
2. Talk to shoplifter nicely (we don't want to up set them or hurt feelings)
3. Congratulate said shoplifter by saying well done mate, and slap the flag on their back (unknown to them)
4. Let them free
5. Report to police
They would then be arested, not for shoplifting but for having a PA flag, said person goes to jail, and it would reduce number of shoplifters on the street.
The police won't arrest them any other way.
If this works, repeat for other offenses.