Darius,
I like your emphasis, but I don´t think it would be a good idea to sent a letter to Shamar like you suggested.
I think he was asked several times why he is still supporting Nydahl.
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marte-micaela-riepe.blogspot.de]
In the letter above he said very clearly:
"The first question concerns Lama Ole Nydahl. Since Lama Ole frequently explains the connection between Dharma and sex, emphasizing that the bliss of sex is the experience of mind, the question has arisen as to why I continue to support him."
And about the teachings Nydahl got:
"Lama Ole received many teachings from His Holiness the late Karmapa and from Tenga Rinpoche. From time to time he had to go to Darjeeling to get his Sikkim permit renewed and while he was there he studied a lot with Kalu Rinpoche in Sonada."
"Whenever Lama Ole visited me, he always talked to me about how wonderful it is that he learned all about tantric union practice from Kalu Rinpoche and Tenga Rinpoche. He thought it was just marvelous." As I said in my Open Letter: "You turned to the sexual promises of the Tantras, to the supposedly power, to the power power over women. This is obviously rooted in your personality. You are a junkie of such drugs."
And so on and on. Shamar was forced to delete this letter from his website one told because of threatening by legal actions.
What Nydahl does not like is to be identified as a Tantric-Master, he has given the samaya to keep that practises and his initiations secretly. Due to Shamar´s dissociation of tantric teachings he is dissociating himself of Ole Nydahl in the same moment. That is what his letter expressed.
On the other hand Nydahl also teaches Mahayana and on that level Samar is side with him. So we can better understand why he is shifting his positions.