The expanding U.S. military role in Pakistan


I understand the theory of rendering the frontier provinces inhospitable to the Taliban forces the U.S. is pursuing in Afghanistan.

But it seems like a very big can of worms to open wide.  A can we've already opened with drone strikes across the border.

I've thought this approach, while perhaps perfectly sensible from a military or strategic standpoint, needs to account for the geopolitical gravity of such moves.  Barack Obama's atempt, in the 2008 debates, both to outdo Clinton and to one-up McCain on belligerence by saying he would cross the Pakistani border with impunity struck me as naive because it didn't pay any heed to that need. 
U.S. military moves in Pakistan, while they may be fundamentally entwined with activities in Afghanistan on the border, are a distinct series of military acts that need to be discussed forthwrightly by the President, in his role as commander in chief, and Congress, given its control of the purse.  The fact that U.S. forces are now spilling over into engaging inside yet another nation in the broader Middle East/South-Central Asia region, especially when tensions remain with Iran, is a significant development.  It's an expansion in scope that should not simply slip by unnoticed.
It concerns me that the U.S. is distracted and increasingly fiscally reckless at home while overextending its military ventures abroad in a delicate and complex region.  That's a bad recipe.