If the cops and ATF were so interested in capturing the guy, as opposed to just killing him outright, why didn't they nab him outside of his house where it would be a lot easier to control the situation, instead of forcing a seige situation?
It's easy to write this off as a psycho who got what he deserved. It's not so easy to blow it off when they come for you because your neighbor got concerned when he saw you bringing your guns back to your house after a hunting trip or day at the shooting range (how many guns can you own before it's considered "stockpiling"?). Do you want a BATF or other government agency that is free to kill people at will because it's too much of a hassle to prosecute them?