Why is there a question of the US bailing out Europe? The answer is simple: Bankers.
If the US doesn’t help bail out Europe, the bankers lose their shirts. If the US does help bail out Europe, then they get paid.
Need more proof that the bankers have a hold on the US government? The Republicans are blocking the Merkley-Levin amendment in the Senate. That amendment is the “Volcker Plan,” which would keep banks from wrecking the economy the way they did in 2008. Banks don’t want that, and their chorus in the Republican ranks is singing their tune.