I'm not going to argue French law with a French lawyer about interactions between the police and the magistrates, but I don't think that is true even in France - is every single person who litters in France, witnessed by a police officer, charged with littering? No, police officers everywhere have to exercise some discretion and prioritize. (There's also a distinction between administrative / criminal law and bylaws, etc, that is not easy to summarize and I won't attempt to).I totally understand.
I’m a French lawyer, so I’m not comfortable with the Canadian legal system, and in France, we’ve the concept of legal equality. The police officer has to apply the law/directive regardless the situation/person.
In France, the final final decision is made by the judge, never by the police officer, even when it comes to the entry into the territory.
Here, in Canada, it sounds like the police officer can do whatever he wants.
Note, this also does not mean that police officers in Canada can do whatever they want. They simply have to make decisions about what is in the best interests acc to their specific, clear instructions balanced against public order and public safety, resources available and priorities. (If the best way to defuse the situation is to let one person through quietly, so as not to encourage the next 100 people to start making the same claim) Sometimes those decisions are easy, sometimes they're not. Sometimes it's obvious to outsiders what should be done, and sometimes not.
Note, I'm not of course privy to what superiors at police service or other authorities had agreed about prosecuting - it's possible this was a conscious decision in first weeks of this new policy.
(And yes the prosecutors get involved at various points and I'm not a practicing lawyer so will just say it's complicated - it's different than French magistrates)
Sometimes this will look odd from the outside - my example is when Toronto introduced anti-smoking rules in bars, the police made a bit of a show about how they wouldn't enforce it. This was basically a lie - they didn't want to deal with angry patrons and physical fights as a result, nor get into drawn out (potentially heated) altercations with bar owners. What actually happened was that it was basically a calm down or grace period - the police eventually did enforce it, but mainly the public got used to it, bar owners figured out how to make it work, "smokers' rights" types realised they didn't have support, etc. Within about six months to a year, you didn't see any smoking in bars in Toronto. The key thing was that by the end of it, police could enforce it carefully and without violence or drama. (Note, I also don't know and am not privy - it's entirely possible the police had agreed this with government/city hall/prosecutors etc beforehand. But if anyone thinks this was the police outright defying the govt, it really wasn't - it was a strategy. In my opinion anyway, a pretty transparent one)