Based on their bio, the author appears to be based in Belgium. Although I have my own thoughts on the matter, outside the US, the right to bear arms is indeed an extreme right-wing viewpoint.
I'm in the UK - I used to belong to a gun club and could have easily gone forward to own a rifle if I wanted to, including a semi-automatic (only in .22). I believe most countries in Europe have similar policies. The main difference between here and the US is the categories of weapon you're allowed to use; here it's primarily sporting or hunting weapons where in the US, using guns for defence (and using serious calibres for sporting/hunting) is within the Overton window.
Note that you can get serious calibre rifles in the UK but only in bolt or lever action. Case in point: https://www.gunstar.co.uk/desert-tech-hti-bolt-action-50-rif...