WHY ARE THE SAS NOT IN ISRAEL HUNTING DOWN THE KILLERS OF OVER 2000 PALESTINIANS?

So the SAS, who were already in Iraq before James Foley was allegedly executed, have now been tasked with hunting down Foley's killers.

One white American gets allegedly killed by a Briton, and not only does the British PM return urgently to London from his holiday, but now the elite British Special Forces SAS have been given the orders to hunt the killer down!!

Why are the SAS not in Israel hunting down the killers of over 500 innocent children in Gaza, some of whom were decapitated?

BTW. I know the name of Foley's killer: Lee Harvey Oswald III.