Adams, who has always denied IRA membership despite the closeness between Sinn Fein and the IRA, argued that his arrest was politically timed in an interview with CNBC.
"My own view of all of this is it was as Martin McGuinness described, 'bad forces exploiting and seeking to stop the forward rise of Sinn Fein'," Adams said.
Sinn Fein, which is nominally left-leaning, has sold itself as on the side of the austerity-laden populace.
Read MoreIreland's credit rating: Second time lucky?
"The other parties are making their own choices, they are pro-austerity, they are loading ordinary people, working people, with huge debt from private banking, from greed and fortune and the financial system," Adams argued.
The ongoing trials of some of those accused of fraud in the lead-up to the crisis has not helped the Irish establishment's case. Last month, the trial of former executives at Anglo Irish Bank, whose troubles helped cause the crisis, on charges of illegally propping up its share price, ended with the judge refusing to jail two convicted men on the grounds that: "A State agency had led the two men into error and illegality."
An official inquiry into the banking crisis will begin this year.
Sean Fleming, Fianna Fail's spokesman on public expenditure and reform, defended the party's record. He told CNBC: "Who caused the banking crisis? Only the bankers and the boards of directors and chairpersons and chief executives. You might say regulators and other politicians do their bit, but they were issuing the bad loans and taking out bad investments."
Across the Irish Sea, there is also the prospect that the U.K.'s Conservative Party may need the support of the Democratic Unionist Party, founded by firebrand preacher Ian Paisley, in the event of a hung parliament after next year's U.K. election. The DUP have also led recent protests over the granting of immunity to republicans for crimes committed during the Troubles.
Prime Minister David Cameron hosted members of the DUP, whose leadership have expressed pro-creationist and anti-homosexual views, in Downing Street earlier in May. If the DUP are granted greater concessions as a result, there could be further polarization in Northern Ireland.