A Moment of Truth?

What will we, the US, do if it turns out to be true that Pakistan masterminded the Mumbai bombing in India? That would make Pakistan a state sponsor of terrorism, which, under our current standing doctrine, would make them our enemies. However, there is some truth, although probably not as much as he would like us to believe, in Pakistan's President's words in regards to our "war on terror": "'You'll be brought down to your knees if Pakistan doesn't co-operate with you... Pakistan is the main ally. If we were not to be with you, you won't manage anything. Let that be clear. And if ISI is not with you, you will fail.'" So, what will we do? Will we, once again, allow our political and military needs to trump our stated standards like we did during the cold war when we supported and/or installed "benevolent" dictators? Will we give a free pass to anyone who gives us enough help in whatever we're most interested in at a given time? I don't expect that we will come down hard on Pakistan, and I am sure there won't be an regime toppling by the US there. But what should we do? Is there anything we can do that won't make us hypocrites without severing ties with a seemingly much needed ally in our current conflicts?