In my opinion; Canadian police forces are far less deserving of anti-cop, paranoid rhetoric than US or Latin American forces. In this case, the police obtained a court ordered warrant before asking the telecoms for the tower dump info. This is exactly how the law is supposed to work
Generally warrants are obtained against suspects not potential witnesses. It's the scope of the warrant that's disturbing. They even say that one of these people could be the killer, so they're basically treating everyone as a potential suspect merely for having their phone turned on in the vicinity of the crime.