I am an avid gun owner and my "collection" (I don't view it as a collection any more than toolbox full of tools) has representatives of all types except one, military style semi-auto rifles. I bought an AR lower once with the intention of building one, but ultimately I sold the lower as I couldn't determine what use building such a rifle would be to me other than for wasting ammo at the range. Honestly, I'd feel like a jackass hunting with one and it goes against my heritage of hunting and the principles of one shot one kill, humane and ethical shots, etc. I am also a bit of a purist, I prefer revolvers, lever and bolt actions, double barrel shotguns and wood stocks.
Now, I realize some people like to collect military style weapons, this isn't who I am talking about. I collect other things, just not guns. And a sidenote, it is a bit of a thrill to shoot a semi-auto with a high cap magazine, but for me that thrill quickly wore off. But what I've noticed is that there is an element within the gun community that gravitates towards these types of guns. I've seen them at gun shows (I no longer go to these "rallies" because of this element) and at the gun range. I try not to judge on appearances, but combined with behavior, some of these people definitely scare me. There's a stark contrast at the range between the folks like me with our revolvers and traditional rifles and the ammo burners/zombie apocalypse preppers.
Again, not trying to offend people who own these, but there's definitely a profile which includes ownership of such a weapon.