Are you suggesting that the FBI tortures every suspected pedophile and spammer who uses FDE?
No doubt this question has already been answered on numerous occasions with respect to such violations in 3rd world countries and enemies of the US and its allies. However, the US government, for all practical purposes, is above international law.
This might not sound so bad on paper, but I personally don't know what I would do when locked in a room with a professional interrogator.
The idea that you can't be compelled to testify against yourself, present in many western legal systems, is a good one, and is designed to prevent both torture and false imprisonment due to torture-induced false confessions. But that doesn't mean it's not a good thing in those circumstances when a guilty person does incriminate themselves.
These are not criminals we are talking about. These are citizens accused of crimes.