In the real world I might as well be. The difference between my position and an absolute opposition to torture is almost completely philosophical.
It might look like that, but it isn't.
I believe in utilitarianism tempered by fairness. To really oversimplify.
Torturing people who might be innocent is incompatible with fairness, but torturing people who are themselves mass murderers or torturers does not violate fairness in the same way. If we lived in a world where torturing a torturer would save innocent people from torture, that would be a good deal in utilitarian terms and would not violate my intuitions about fairness.
As I stated before since the theoretical gain of deterrence would not be realised, in practise I'm (virtually) absolutely against torturing your government's torturers as well.