I am not now, nor have I suggested that any one make a decision, or not make a decision, based on what is not known. My whole premise with the "you do not know" is that you and yours make the assertion that torture was necessary. My whole point in that regard is that you do not know this, nor can you prove it.
So now, how exactly do you get government policy from "you can't prove" I do not know. The "you cannot prove" is internal to this debate, not to the government deciding how to handle things.
I do thank you for giving up on the whole overblown "suicide" line of argument though.