Your mistake is that you are equating the larger concept of "Security", with what CATSA does to you when you go through some screening point. That procedure is only a small part of the process and I would suggest a fairly minor one. Just because someone is not subject to a metal detector does not mean that they've been exempted from all security scrutiny. You're starting from a position of fallacy.
The CATSA process is largely theatre. Seriously. It does have a purpose and a place - you still need procedures to guard against the cranks, the mentally ill, the people who think it's ok to carry a canister of bbq fluid or hunting knife on board, or yes, some zealot with explosives in his underwear. But a determined, premeditated attempt on an airliner or airport is not going to be stopped by our friends at the metal detector alone, their heroic fantasies aside. The heavy lifting of security is done elsewhere. It has far more to do with intelligence gathering and sharing, than a minimum-wage earner fending off entitled flight crew.
You either trust everyone or you trust no-one.
What nonsense. Of course there are different levels of trust. Fascinatingly, they usually correlate to different levels of responsibility. It's absolutist statements like this that totally deflate an argument. Acknowledging that - whether you like it or not, agree with it or not - different roles come with different procedures is the first step in not painting the whole world in black and white. I hate to tell you, but there is no procedure or policy that can provide 100% security. So like all risk management, it comes down to percentages. The enhancement to overall security, of having known-armed, law enforcement personnel screened to the same degree as the general public, is infinitesimally small versus allowing them to bypass screening. That is evidently the conclusion reached by those who assess security risk. I agree.
The more this "debate" continues, the more it just seems apparent it's completely motivated by the very Canadian idea that everyone is equal. Which is of course, not true. Unless one can honestly say they lie awake at night fretting over CBSA and police officers plotting to blow up an airplane, why not just admit it irks big pilot egos to see them able to skip an unpleasantry pilots face every day?
I’m still waiting for my white male privilege membership card. Must have gotten lost in the mail.