There's also the kid factor if you're playing on the TV in the living room. Kids have a way of walking in at the worst time. As someone who enjoys violent titles, I get it.
This line should be auto-pinned at the top of every single HN thread where the topic crosses over into target markets for products. (I'm joking, but the point stands - HN is both wildly different than the average individual and many of those on HN overlook that fact)