First, the tax is a dumb idea. They should not get the bonuses in the first place.
However, since the money for the bonuses comes from the government...the claims of “bill of attainder” will not hold up in court...since the bonus money “comes from the government”.
This AIG bonus stuff reminds me of the Stalin-Trotsky power struggle in the old USSR....only this time the Socialist-Communist struggle is between Democrats and Republicans....with Dems supporting some re-compensation for the AIG bonuses...while the GOP and pseudo-cons want to continue paying tax dollars to failed AIG execs.
Please explain how the putative source of the money (which is fungible, of course) changes the fact that the bonus recipients are being punished for fulfilling their end of their contract and accepting AIG’s payout.
I assume you have used your federal tax return only for Obama approved purchases, yes? After all, the money came from the government.
While you are writing you may want to think about the fact that mortgages, car loans, insurance, and your very paycheck are all contracts, which now can be broken at will if some government yahoo can get up enough outrage over them. A contract is a contract is a contract... If a little brewed up outrage is all it takes, I will expect you to endorse the abrogation of any and all contracts, including your paycheck.