Sophie, I agree with you that the Dalai Lama's actions has done tremendous harm to practitioners of of the Protector. But at the same time I cannot doubt that the Dalai Lama is Chenrezig the Buddha of Great Compassion. I take what is happening and respond in 2 ways.
To lift the ban, we cannot spread negativity about a holy being as it can cause heavy negative karma. What I will do instead is to spread the practice. I hope this strategy will overwhelm the karma that is the cause of the ban and for the Dalai Lama to lift the ban. Secondly, I try to make sense of the reason for the ban, given, on one side we have the Protector who is one with Manjushri and on the other side Chenrezig. Can the Buddhas be against each other? If not, why? I conclude that all that is happening is from our side. Their actions are pure and it is the humans that are deluded and the events of this ban is pure but it is our reactions (including the CTA) that is deluded. Let's keep some sanity here and help to alleviate the suffering of the practitioners by working to lift the ban. Spread the practice. I suspect this is the intention of the Buddhas.