That's just pathetic!
I don't know what kind of "orientation" they give you when you go in the BWCA, but if it DOESN'T include some fire building "etiquette", then maybe it should?
Of course the people who do this type of thing are probably not the kind you can "educate".
 When I find a spot like that in the Q, if the site is nice except for something like that, I'll clean up and saw/split wood for the next guy.
I don't ditch logs in the woods, because the same type mental morons who did it the last time will do it the next :(