>>2863Because it's cool, anon. I don't know if there's actual explanations to any of those questions, but I assume most people let them slide to focus on and enjoy the display of struggle, righteousness, and plain badassery. That's what I do, anyway. The apocalypse is just set-dressing to make life harder.
As for the other media, they're both good, but the manga has the quicker pacing. The anime would probably be a slog if you watch it for the "so bad its good" factor.
Hell, I like it and I've still never finished it.