Excluding some body from the Blockchain is censorship. This is all we need to know.
You misunderstand, a coinjoin coordinator has no power to exclude anybody from the blockchain. A coinjoin coordinator can only exclude someone from their own coinjoin transactions.
Why should o_e_l_e_o BAN these 'vigilantes'? Why do your solutions always imply censorship, Kruw?
If o_e_l_e_o doesn't ban them, then a valid transaction will never be constructed. The coinjoin will remain unsigned forever.