From the article: "It contends that the onerous nature of the rescue — the taking of what became a 92 percent stake in the company, the deal’s high interest rates and the funneling of billions to the insurer’s Wall Street clients — deprived shareholders of tens of billions of dollars and violated the Fifth Amendment, which prohibits the taking of private property for “public use, without just compensation.” From a di…
If AIG would have went bankrupt, shareholders would have got nothing. After all the liabilities paid out(to the wall street clients who had credit default swap contracts), there would have been nothing left. US put 170 billion into a company worth $2 billion(market cap at the time) for 92% stake. There is no legitimacy to the claim.
Given the fiscal situation I'm sure they would have seen the error of their ways. AIG being liquidated would have been possibly the worst thing for AIG's creditors and the best outcome possible for the people of the United States.
The government used the assets of AIG for it's own purposes and did not compensate the shareholders, the government was perfectly at liberty to let the institution collapse, but instead chose to prop it up.