I would personally recommend against leaving the letter on your Troper page. Explaining your reasons for leaving is perfectly acceptable. When dealing with a crowd like them (especially as your last act) suggesting that they shut down the entire site because it has changed from what it used to be (despite that change being negative) will be met with mockery and ridicule.
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The Master said: "It is all in vain! I have never yet seen a man who can perceive his own faults and bring the charge home against himself."
>Analects: Book V, Chaper XXVI
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The Master said: "It is all in vain! I have never yet seen a man who can perceive his own faults and bring the charge home against himself."
>Analects: Book V, Chaper XXVI