Here's a perfect example of a vandalism edit (well, an experiment) that should be greeted with a welcome and an invitation to contribute usefully to Wikipedia.
http://en.wikipedia.org/w/index.php?title=Wikipedia:Help_desk&curid=5646...
Unlike all the Wikipedians on this list and on Wikipedia who advocate allowing editors to vandalize Wikipedia multiple times and claim they are far preferred Wikipedia editors than the old established trash, I also welcomed the editor to Wikipedia.
KP