[jaywalk]

You're looking at it completely backwards. Congress was fine to let the EPA run around and do whatever, because that means people can bitch at the EPA instead of Congress.

> Why is it the court's job to tell congress what they meant to say?

That's... not what they're doing. The court is telling Congress that if you want an agency to have the power to make vast, sweeping changes, then you have to be explicit. They don't get to create an agency and then just give them blanket authority to do anything they want, at any scale.