It's up to firearm-rights activists to accommodate debate from laypersons (and politely educate them if needed), just as doctors, scientists, and other experts must do so for respective laypersons they encounter in each of their fields.
No it's not. At least in the US, our patience has been exhausted by decades and decades of bad faith on the other side, going back to the '50s at minimum, arguably the '20s to 1934. We have nothing to discuss, especially since we've politically won for the foreseeable future, and after we keep telling the other side the same thing over and over without effect. Now the proposition is simple:
Come for them and we'll come for you.