Only because they cannot reach us.
Some people in Pakistan might hate the U.S., but I don't think anyone wants to invade the U.S.
We did the Pakistani government a favor by getting rid of bin Laden, they didn't want him there. He was trouble for them. But there is to large a group there that would have made more trouble if they turned him over. But, the U.S. operation made them look stupid and vulnerable. And no country could just look the other way, when something like this happens on their soil. They have make a stink about.
What they could do is a Mumbai style attack on a city. Would only need a dozen or two for that. And we know they can approach with small craft virtually undetected.