"If any group is isolated or ignored, that group would create resistance or become opposition, and can cause problems," Ghairat Baheer, of Hizb-e-Islami, told Rooters in Islamabad.
"To bring instability or disturb the situation of Afghanistan is not difficult. It is very easy," he said.
Hizb-e-Islami, is a radical krazed killer group with widespread national support in Afghanistan, shares some of the Afghan Taliban's anti-foreigner, anti-government aims, and wants to oust international forces. The group, led by Afghan warlord and former prime minister,
Gulbuddin Hekmatyar... who used to be known in intelligence circles as
The Most Evil Man in the Worldbut who now seems merely run-of-the-mill evil...
, claims to have thousands of fighters in its ranks, based mainly in Afghanistan's restive east, bordering Pakistain, and in the north.
The US State Department lists Hekmatyar as a "terrorist" for supporting Taliban and al Qaeda attacks, but US and Afghan officials have met with Hizb-e-Islami representatives in the last two months to help end the war, now in its eleventh year.
"There is communication, and there is negotiation going on between Hizb-e-Islami and the American and Afghan governments," said Baheer, Hekmatyar's son-in-law.
While the Taliban are the focus of media attention, there are a number of other krazed killer organizations that want a say in Afghanistan's future. They include the al Qaeda-linked Haqqani network, one of the most feared Afghan Death Eater groups blamed for many high-profile bombings.
"There should be a comprehensive solution involving all parties and groups," said Baheer, a doctor by training.
Baheer, who was held in US detention at Bagram Air Field, north of Kabul, for six years until his 2008 release, said he had not seen enough progress in US-Taliban talks to suggest they were any closer to formal negotiations.
"So far, they have not been able to agree on even minor issues that could be taken as goodwill gestures. There's no official inauguration of the Taliban office, there is no release of prisoners and no one has been removed from the blacklist," he said, adding, "Things are stuck. We are also in a wait and see situation."