The problem with your train of thought is, that a lot of these densely populated areas are called things like school, work, super market, public transport or hospitals. Plus, access to masks and even information was never entirely fairly distributed.
When I went shopping, I often had people come close up to me, sometimes without masks, even when I told them to please keep distancing. Even when masks were mandatory lots of people let their noses poke out or just wore extremely badly fitted masks.
It's nice to hear that you evaded the virus, at least you didn't get noticeably sick, but you shouldn't treat that as something easy that everyone can do. In my opinion you just got lucky that no one drilled a hole in your defences. And possibly in a lucky position to even enable that, as said, a lot of common infection areas aren't easy to avoid for many.