To erase a souce and to replace it with a "fact tag" is not to "think an edit is helpful". The only definition is "vandalism". "Ninguém" is a not a new user, he does know very well what he is doing in Wikipedia. He knows very well that I posted a source that gives the 3 million figure, and there was no reason to reverte my edit, unless he was trying to rise another disruption, as usual.