"Those that authorised this (arrest) didn't make the right strategic decision," Adams said at a press conference in Belfast's Balmoral Hotel yesterday. "This is entirely a wrong signal".
Adams, a key figure in the peace process, was arrested on Wednesday in connection with the death of Jean McConville, a mother-of-ten abducted from her home in 1972.
The Police Service of Northern Ireland (PSNI) freed Adams at around 2200 IST after four days of questioning, but the republican leader could still face charges when a file is sent to prosecutors.
He claimed that the timing of his four-day detention was politically motivated with European elections due to be held later this month.
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"I make the case that those who authorised my arrest and detention could have done it differently, " he said, flanked by Deputy First Minister Martin McGuinness, the top Sinn Fein member in the power-sharing government.
"They did not have to do this in the middle of an election campaign, I contacted them two months ago."
He also repeated his commitment to the US-backed Good Friday accords in 1998 that largely ended three decades of sectarian violence.
"There can be no going back," he insisted. "We are totally and absolutely committed to the peace process and I bear no animosity to anyone.