I think that you have it exactly backwards. Because we believe in the rule of law, we will not convict someone using illegally obtained evidence. That does not mean that we shouldn't continue to spy on foreign enemies and do other things that will give us vital information but will not produce evidence to be used in court. It is this separation between law enforcement and intelligence that lead to the creation of the so-called wall that many on the right say was to blame for 9-11.