Re: America has right to interfere in Pakistan’s affairs…
Not really, Israel continues to disregard US (or world that matter) voice against settlements, think about Syria making a move and creating settlements in disputed lands 
It is not about functional/dysfunctional state/democracy. US has been interfering in countries whether it is functional or not, whether its democracy or not. If you think Zia was just a crazy nut or Mushy was a crazy nut to have overthrown ‘democratic govts’ then your head is just in the sand and you don’t know about it.
As kakaballi has pointed out, it is NOT the govt that is going around inventing things in Israel or India. Govts job is to provide stable society which then invites investments and bears fruits.