"Canada has a half dozen. The US has 500"

You dodged these two:

How many of those half dozen were detained on the battlefield?

How many of the 500 were detained in the US?

Here's a new one.

How many of the 500 are US citizens?

I take it you want to concentrate on what the US might have done wrong and not question if it is different from what Canada has done.

I think the word for that is hypocrisy.

Torture for 3 or more Canadian Citizens was outsourced to Syria.