The Truth for Reconciliation Commission (TRC) has not been impartial and its report on its findings on the 2010 riots is intended to help former prime minister Abhisit Vejjajiva and his former deputy Suthep Thaugsuban, according to red-shirt leader Tida Thawornseth.
Ms Tida, chair of the United Front for Democracy against Dictatorship (UDD), said she questioned the TRC's impartiality since it was established by the Abhisit government in 2010.
It was not believable that a government would set up a commission that would find it find fault with its own actions, she said.
Therefore, the TRC's report came out in a way that presented the peaceful struggle by the people as illegal and where the "men in black" gave the then-government the legitimacy to use force against them, she said.
She said Kanit Na Nakorn, the TRC chairman, was once a member of the dissolved Thai Rak Thai party, but left in circumstances that certainly were not with love.
Mr Kanit was also appointed by former prime minister Surayud Chulanont to chair an independent committee to investigate the killing of people in the war on drugs during the government of former prime minister Thaksin Shinawatra.
"How can this kind of person be impartial or independent? The TRC report also said Thaksin's court win in the shares concealment case was the root cause of the whole problem," she said.
Therefore, the report of the Kanit commission would not lead to reconciliation, but only to more hatred.
"How can the TRC be impartial when its chairman harboured so much hatred for Thaksin?" Ms Tida said.
She said Thaksin should not make any comment on the report of the TRC chaired by Mr Kanit.
Moreover, the information in the report lacked credibility and was not scientific, she added.
The UDD chair said the TRC report was full of bias, sowing hatred for the red-shirts, blaming Thaksin as being the cause of all problems, and giving legitimacy to Mr Abhisit and Mr Suthep.
No matter what, the facts on the 98 (sic) deaths, when established, would finally turn the public against the TRC, said Ms Tida.