We can cancel your account, but really all you need to do is stop using it.
I think we should reply to your political criticisms of us, not so much because you have a coherent case to make, as because it will be educational for our comrades. I will propose this.
In terms of your claims of censorship, all we have ever done is ask you to remain with the editorial policy of the website (by not being abusive, not cutting and pasting long articles, not posting comments unconnected to posts). No one has ever tried to prevent you from making any political argument.
Anyway, on one level I'm sorry you've decided to stop engaging with us, though on another level - given your behaviour on the site - I'm honestly relieved.