It is likely because Iago would not speak of his deeds publicly where you could read them and insisted on private comments. He answered some questions, I permitted visitation -- on the condition that he tether public apologies, which as you can see he openly refused to do.

What have I ignored? I am under the impression that I have responded to you at every turn.

Just because I do not respond the way you want me to, and I do not afford to you the same special treatment the two of you enjoyed under the Master, does not mean I am ignoring you.