Even if meta data could be useful for stopping murders and rape, it is really worth providing the police and other law enforcement agencies this kind of power o

Even if meta data could be useful for stopping murders and rape, it is really worth providing the police and other law enforcement agencies this kind of power over the populace to make this end? Especially, when the number of cases it could stop would likely be small? I don't know about you, but outside of major destructive threats like terrorism, I don't really want the NSA involved.