True but if they find something without probable cause you may have a leg to stand on with a good lawyer. I have nothing to hide but I also dont want to give civilian police the idea they can do whatever they want. And like you said it is a big inconvenience.There is some truth here too.
I know this story is rare but I have heard of people buying used cars getting pulled over and it turns out there was old drugs or residue in the vehicle. To prove this they had to use an expensive lawyer. I dont want to go through that. I know that is a rare and unlikely example but I am sure someone smarter than I could think of a more likely situation that could occur.
At the end of the day I like my privacy and not being treated like a criminal.