Because my presence in the GOP galls people like you so much.
That may be one of the only honest things you have said. So you are the kind of person who does things to deliberately upset others? What an admission! And you prefer to not just upset them but to gall them? And you, I guess, like to do this over and over - because you did write the letter about leaving the GOP. So now you're back I guess - so that you can gall some people (if you can) and then perhaps you'll write another letter saying that you're leaving again?
Can you tell when people come back from happy hour and jump on the PC and start typing? I'm sure you can.