SURELY they wouldn't use generalization to put the worst potential crimes and thoughts they dislike in the same bucket.

All you dissenters are under arrest. The only reason you'd be against this is if you're planning to commit a crime; therefore, you must be planning to commit a crime!

The limit case of prosecutorial discretion is pragmatically indistinguishable from tyranny. The more selective law enforcement is when everything is illegal, the less meaningful the laws themselves actually are and the more important the personalities of the enforcers.

Unfortunately the notion that law is best used to restrict government is a uniquely English cultural development. It’s unsurprising that Canada is losing that as she accelerates away from her English heritage. In principle of course there’s no reason a multicultural society couldn’t adopt the principle, but I’m unaware of that actually happening except for lip service.