I guess civilization hasn't quite reached Arizona yet. Lots of us here use bayonets for digging tools. I saw one last week that appeared to be a German '98 Mauser, one M-16 and I sometimes carry (depending on where I'm going to hunt) a bolo-style from the Spanish Civil War. They are very sturdy and work pretty well in the turf. In non-turf areas my favorite tool is still a little pick with a thin spike on one side and a mattock blade on the other.
I haven't had any problems with the bayonet here, and it does seem to keep the bums at a distance. Arizona is one of those places where you can still walk around in public, even in a restaurant or store, with a pistol if it's visible in a holster. I wouldn't try it in a bank though!!
Marc