1) If another front was opened, just how would it be maintained? Does the USA have enough ectra troops for a new front?

2) It would likely turn Pakastani's against the USA, and could be viewed as agression by even those opposed to terriorism. Other Muslim countries may see this unfavourably.

3) It could likely undermine the new coalition government.

4) With current uncertainity as to who really governs, who knows what chaos could result internally President Musharraf mostly controls the military, and seems to have a shakey relationship with the Prime Minister and the current government. In the past, he has warned the USA not to launch military actions in Pakistan. Would he use any USA military action as an excuse to re-establish his control of the government and to undermine the skakey democracy?

5) It could result in a total loss of Pakastan as an ally against Terriorism and eventually cause greater problems.

6) Drones, bombs cause colateral damage and potentially innocent citizen deaths. Special Forces could have real difficulty in a close-knit troibal area like this.