Why? Because a few Muslim fanatics get upset over the presence of Jews? We do not give children a veto over the legitimate activities of adults. Ban the Muslims who are offended. Problem solved.
But you do raise an interesting point. Some 1300 people died of heat prostration this past June while on Hajj in Mecca. The Hajj should be postponed for a couple of years until it occurs during cooler weather, or at least until the Saudis install air conditions. Goodness, they certainly can afford it.