I like shotguns, but I don’t think they’re a great defensive tool. Even with massive extenders on the magazine tube, you are getting a max of 8 shots, and reloading quickly is a pipe dream unless you are one of the very few, very highly practiced competition shooters.
I’m not saying you are wrong, but the biggest difference, and one that actually matters, is that there was a very clear us vs. them defined and easily spotted. In Vietnam, Iraq, and Afghanistan we were fighting against people that blended in and weren’t being actively turned on by their neighbors. Here, you can bet every dickish Dick that voted red would happily report on the neighbors that they even have an iota of suspicion about resisting the orange cunt.