See, this is why you are confusing, one second you're saying you're not for gun grabbing and banning, the next you're talking tough about what will happen if the cops show up to confiscate their guns. Pick a message and stick to it. Maybe not this one, as I'm not entirely sure you're right about that. At the very minimum I would expect a lot of guns wouldn't be recovered without a shovel.
Culture 100% plays into this... One big difference is that the majority of Canadians do not look at their firearms as being for self defense, whereas many Americans consider them as normal in home defense as a smoke detector. Also, it's built into your constitution. That would indicate a cultural prioritization of guns that goes well beyond anything Canadians can relate to. Multiply these variables by the number of years it's been this way, and I'm sure you can see why a Canadian approach to gun control would never fly in the states...or, at least, you should be able to.
Then, consider one more time the existing saturation of firearms in America, compared to Canada. It's just unrealistic, man... :shrug: You're spinning your wheels for nothing. You guys need to come up with your own way of protecting yourselves, in a society where there are already 300 million guns out there, and nowhere near the numbers with a desire to change that required to actually do so.
So...do you have any other ideas you'd like to discuss with the law abiding, responsible gun owners, aka citizens just like you, who's help you'd like to make things safer in America? Something that, perhaps, both sides could get on board with?