Who you are is irrelevant because _you_ are irrelevant.
Dobbin fully understands your unwillingness to identify yourself. You see, it's dangerous to do so, particularly when you are taking an inflamatory position- a position that offends folks deeply. There are nutbars out there who really are a threat.
When you are just playing around, anonymity is probably a good plan. Why take the risk for something unimportant, that you have no intention of following up?
However, the degree to which you are willing to allow yourself to be known is also a good gauge of your commitment, and consequently, your credibility. When you truly care, you don't just write on the wall and sneak away before anyone sees you... You stand up, let folks know who you are and that you won't back down. You act, and let yourself be known to act.
I'm anonymous here, too, in no small part because I've been credibly threatened for publicly acting on my opinions before. It's not pleasant, and challenges the courage of ones convictions. I won't face that again for the sake of cheap babbling points in some pissant internet forum, just to quell some anonymous blowhard. The pseudonym suffices to address an irrelevancy.
However, if you ever became anything like the threat you think you are- if you publicly stood your ground, and seemed to actually be making ground, you'd know me, too, soon enough.