His announcement that the party was withdrawing its support to the Centre over the Lankan Tamils issue was a late decision, she said while also referring to a Tamil saying.
When the war in Sri Lanka was at its peak in 2009, he embarked on a "three-hour fast drama," but neither pulled out his party nominees from the government nor withdrew support to it, she said in a statement here.
"Sri Lankan Tamils would have been saved if he had withdrawn his support to Central government then. Karunanidhi did not do it. This is a very big betrayal of Tamils," she alleged.
The "second betrayal" came when DMK did not insist the Centre to implement a Tamil Nadu Assembly resolution in 2011 that called for economic sanctions to be imposed on Sri Lanka till Tamils in the island nation were ensured status on par with the majority Sinhalese.
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"While he squandered all the opportunities to strongly voice against the Centre, he has announced quitting UPA today, which amounts to washing his hands off responsibility," she said.
On his demand for a resolution in Parliament incorporating two amendments sought by him to the US backed initiative against Sri Lanka in UNHRC, she said it wont help the cause in the present situation as a motion in the UN rights body alone would enable taking strong action against Colombo.