Its not about 'might' and 'are', its the third time in this past week that fingers are being raised at Pakistan's state organization and army supporting act of terrorism. Its not India, this time its former head of the state and Pakistan's neutral ally.
Who the **** cares if it's the US and how often they are doing it. How often did you hear before Iraq war that Iraq had WMDs. Very few people trust the words of the US state anymore when it comes to these sorts of issues, mostly tea partiers. Well, except the Indians. Don't overestimate how popular this conspiracy theory is in the west.
They have not provided any evidence, and that brings this story (i.e. a conspiracy theory) to and end.