Around 99% of all militants in Afghanistan are also Afghans but that doesn't stop Uncle Sam blaming Pakistan for all of its failures in Afghanistan. If a super power can blame Pakistan, cut its support fund, do propaganda against Pakistan at all levels, side with its biggest enemy on the pretext of Haqqani network then why Pakistan shouldn't blame Uncle sam for each and every of the death happening in Pakistan.
If US can bomb civilians daily in Afghanistan but can't bomb Mullah Burqa and Kurasanis even once in 365 daysw of the year.