Someone "universally against gun control measures" here. I'd be interested in knowing how I'm as ignorant as people who want to regulate things based on scary buzzwords, vaguely describing items that they generally lack any knowledge of.
I'd assert it's possible to hold this position, yet also be quite well informed about the history, mechanics, laws, and social consequences surrounding firearms and their accessories. For example, one could simply consider retaining the individual agency that this part of the Bill of Rights has preserved for us as being of higher utility than any of the downsides that additional (or existing) legislation purports to address. My personal view is a bit more nuanced than that (in fact, I agree with most of your post), but wanted to point out that one could start with different base axioms/heuristics, examine the same data, and end up with a different end perspective via perfectly rational (i.e., non-ignorant) reasoning.