So you get to a point where mass surveillance is justified by the anti-crime angle; there is no contradiction, libertarianism logic where you can live and let live requires no crime...
Whatever technical definition of Libertarianism you're using is very narrow. Nobody is under the delusion that Libertarianism requires no crime.
You see, that's the great thing about Libertarinaism, it can be whatever you want, and when there's something you don't like you go "but that's not real Libertarianism"