I view Olsen, Bernardo, Picton et al as animals. In my eyes they lost their humanity through their actions and should only be kept alive only to study and try to find a way to prevent their re-occurence. However I also don't think they should be on a "worst citizens" list either, because while their crimes are shocking to all and devastating to their victims, ultimately the scope of their impact is small, when you talk about a country with a population of 30+ million people.
Entertainers like Dion or Lavigne only annoy us if we let them: turn them off and no more issue.
Politicians are a different story: their actions in office dictate how their constituency is run and in the case of a PM it affects everyone in the nation. There is no question in my mind, that the worst of the bunch was Trudeau for a host of reasons that have been bandied around numerous times. He may have had charisma and press appeal but we're still living with the results of his actions today.
I think you are on to something there. As for Trudeau, I'm glad to see there is someone who is on to the reprobate.