Allah set Hajj for the consolidation and reinforcement of the religion.
I sent my father to Mecca for Hajj with my first paycheck
There is no doubt in the sanctity of Mecca, but a donkey won't become a Hajj pilgrim by just going through the motions.
If Islam opposes terrorism, then Saudi Arabia should announce that no one supportive of ISIS or Al Qaeda is welcome in Mecca to make Hajj.
The hajj is one of the five essential practices of Islam; when they make the pilgrimage to Mecca, Muslims ritually act out the central principles of their faith.