it's about pointing out the fallacy of the "right" and the interpretation of it.
The right to defend yourself is not up for debate, so the debate is actually about what is reasonable to defend yourself. The second amendment defends the right for people to own a gun, but it doesn't have to have the same scope as it had when it was written.
Logically, nobody buys a gun because they are planning to fight the government ( or maybe a few do), but they do because they are looking for a reasonable way to defend themselves.
What is reasonable? Well in countries like the UK or France it's perhaps not as reasonable to own a gun, because it's unlikely that the people who you need to defend yourself from, also don't have one. This is true, because we can see that in the UK for example, it doesn't seem reasonable that even the police should have a gun.
Is this logic good for the US as well? What would happen if you took an unarmed London police force and you put them patrolling the streets of New York City? Not good? Why? after all, what's good for the UK should be good for the US, no?
Now let's reverse this. Let's take all of the criminals in the US along with their guns, and transfer them to the UK. This should be just fine for the unarmed population of the UK, as well. Not good? Why not?
But wait, since the UK has tight gun restrictions, i'm sure all of the criminals would hand in their guns, so it would level the playing field, right? Isn't that how it works in a perfect world?