ISI aids the Taliban

Reason number 462 why Pakistan is just as large a problem for the Obama administration as Afghanistan…if not a larger one. If the Pakistani security forces are actively engaged in aiding the Taliban against the Afghani and Coalition forces then shouldn’t we cut off aid to such forces? However, if we do cut off aid, how does the US prevent the Pakistani government from collapsing and extremists take over? Just one of the regional catch-22’s facing the US government.