Patrick Mercer MP has told Daybreak that the conclusions from the al-Sweady inquiry will "not be satisfactory."
He said the families "need to know the truth", but explained that both sides of the argument were "completely polarised".
Today an inquiry into the deaths of 20 or more Iraqis will begin, expected to last until 2014.
It is alleged that UK soldiers killed unarmed civilians and tortured detainees.
More top news
It comes just days after a father streamed himself murdering his daughter before killing himself on the social media platform.
Still got an old style paper £5 note? Well, you only have until Friday to spend it in shops before it ceases to become legal tender.
Liang Sheng-yueh's girlfriend, who was found by his side, died three days before they were discovered.