Ekka, I think you missed the boat on your last picture. The "Beware of Dog" sign should be modified the read "Beware of Tree Butcher"
Yes we are preaching to the choir here, BUT if someone would like to assemble a link of "International Arborists Against Topping". I would gladly promote it. I hand out the ISA pamphlet "Why Topping Hurts Trees", and can honestly state that ALL my clients minds have been changed once they are enlightened.
Since the ISA isn't as International as Tree World is, I think a document produced by the members here would even drive the point home better.