It's sarcasm Bill, what good is it having dentists if everyone's got perfect teeth?
I'm not saying all the trees here are perfect however in comparison not a lot of real bad shit happens to them for most part.... sadly.
Be great for business if some bad assed bug etc started killing a bunch of trees like over there ... either treat your tree or cut it down, and then toss in the kicker which would be only certified people able to do either.
But nope, aint like that here.