If you want to stay anonymous, who am I to uncover you to the public, for a few clicks and a pat on the shoulders?
If anything, we need to fight for our rights to remain anonymous. Online, offline, anywhere. The most massive clue that we need anonymity should be the zeal with which politicians and powerful corporations try again and again and again to force us into using real names online, make everything trackable, and pierce any pseudonymity or privacy layers. These fuckers never, ever, have our interest in mind, and constantly lie to us about what their real reasons are (seriously, in countries where laws can be made by public vote, we should pass laws that any politician saying "because of the children" is put into jail for a year).
Don't just let Banksy remain anonymous - let us all be anonymous whenever we want.