This story is as old as the Arab occupation of Jerusalem (and of anywhere else muslim occupation took place). Islam is the most intolerant and racist religion/ideology in history, next to nazism. The right question to ask is why are the Israeli authorities doing nothing?
Jerusalem Gay Pride Parade: Stabber is Yishai Shlissel, the 2005 parade attacker (Haaretz)
from the article: 'Waqf Temple Mount excavation damaged archaeological relics'