Normally, I too would be disgusted by the thought of bombing holy places, and would disapprove of invading someone's country. But Pakistan is different. That wretch of a country, officially our "ally" like Saudi Arabia, is harboring people who plot to terrorize and murder us in its borderlands. Meanwhile, Saudi Arabia funds terrorists under the guise of "Islamic charity."
If it came to that, we would need two simulatenous strikes. Bomb Pakistan's nuclear reactor, then launch a massive strike in Waziristan, where Bin Laden is said to hide. Then, once the nukes are out, occupy some parts of Pakistan and ask India to invade and occupy other parts. Pakistan is a patchwork of different linguistic groups like Baluchistan, Punjab and Sind. The proposal to dissolve Pakistan itself would delight India, because Pakistan has been one of their biggest headaches since 1947.
While I also don't like Tancredo, as I sense he's a right-winger, his proposal is not that of a madman. Israel has warned Egypt that if Egypt ever attacks Israel again or lets Egypt be used to do so, Israel will bomb the Aswan Dam. The accumulated water, unleashed, would flood practically all of inhabited Egypt a la Atlantis. Bombing Mecca and Medina is going too far. But if we bombed, say, the Saudi highway leading to Mecca plus the port of Jiddah where pilgrims land, the FEAR that actual destruction of holy sites might occur would chill the jihadists' passions.