The daftest thing about all this is how totally self defeating it is. Graffiti can have its place, and can be useful as a polital force. This however shows nought but the uninformed idiocy of its perpetrators. The worst thing is, somehow, that it's not even good vandalism. It's half-hearted, cowardly vandalism. Thank goodness they didn't attack the Long Man himself, but how crap and uncommited does it make them look.
In fact, if someone really wanted to make the pro-hunt twats look really shit, this'd be a fine way to do it...