I don’t think the issue is whether the guns are safe to ship or not, Canada Post figured out how to safely ship guns from both retailers and individuals years ago.
And the way I read this, it doesn’t sound like the issue of conflict is from licensed owners either because it sounds like we’ll be expected to simply drop off boxes with guns in them so those that don’t want to participate simply won’t show up to the post office (aka avoid the conflict all together).
If I’m wrong and the government actually expects Canada Post carriers to go door to door bringing people boxes and say “pack up your guns right now and bring the box back out to me” that’s an entirely different story and way, way outside of Canada Post’s regular duties. They definitely aren’t equipped or trained for that sort of thing; that’s the type of thing you’d expect police to do.
I think the fear of conflict is because everyone and their grandma will know when there are tons guns flooding into post offices all at once and both post offices and carrier trucks will become prime targets for criminals. The locations and vehicles aren’t designed to resist that type of intrusion and the staff aren’t trained or equip to deal with it (I’m sure there are a few locations/vehicle that are but not only is it a very large, spread out volume to begin with, it’s not hard to find info from industry groups claiming that the Liberal estimate for the number of affected guns is quite low).