Um. This might get some people annoyed at me, but:
To be honest, eliminating 'historic' graffiti is not exactly high on my list of problems with the French. (What with Sarkozy in office over there, I'm starting to like them all a lot more, though.) I can understand the POV saying that they should have kept the trees, but I don't really think it's inherently that big a deal. Obviously some people do, so they should of course consider keeping the things, but...? I mean, if some random French soldiers rescued America, then carved their names into, say, a rock cliff... then that cliff eroded underneath and became a potential hazard (note that the trees were a potential hazard) wouldn't we do something about it? What probably should've been done was the local officials should've helped pay for pruning.
Alright. Now that I've offended everyone, I'm gonna shut up now. My apathy's gonna get me killed yet.