No, Harry had with held nothing, all he knew was it was big, bad, and so ugly it made him catatonic, he conveyed that information, the pack still backed him..
Just to be clear, by stating the premise, I wasn't endorsing it.
@Morris: Okay, I see what you're saying and agree with your conclusion about Harry wrongly denying them informed consent. It's a little trickier than "informed consent" because I think, in the DF, people are incapable of making an informed decision about gaining knowledge. This applies to Harry as well. There are several situations in which he chooses knowledge knowing there are likely to be negative consequences and he has no way of knowing the kind or degree of those consequences. (His mother's gift, and the knowledge of the Outer Gates). But they can at least choose for themselves if they are willing to take the risk of knowledge or remain ignorant. Then again, how many of us are exercising informed consent when making medical decisions? I'm certainly not a physician. So maybe "informed consent" is the perfect analogy.
I think that there is truth there being safety in ignorance, but, like all things, it's not all to the good. There is danger in both knowledge and ignorance. "A little bit of knowledge is a dangerous thing," for example. I do believe that Harry can limit their danger by keeping them in the dark about certain things, that keeping them in the dark about other things would increase their danger, that it is very hard to tell the difference between the two, and it, at a certain point, shouldn't be Harry's choice.
I'm in complete agreement that it is all about Will choosing what risks, with regard to knowledge, that he is going to take as the leader of the Alphas, and not Harry.
Throughout the novels, we have seen the themes of information is power, sharing that power is a responsibility not to be taken lightly, and the third theme that I'm not quite certain how to word. The third theme involves that the responsibility for sharing information, which is power, isn't only on the person sharing. There is a point when it would be wrong to share information and a point when one should leave the decision to the recipients after warning them as best you can of the consequences. For an example, later in the series, Harry is keeping secrets from Karrin. She starts to get mad and confronts Harry. She says something like "you better not be doing this to protect me," and Harry responds along the lines of "no, I'm doing this to protect me." Then she is okay with it. She's okay with it because he isn't denying her agency.
I think a good example of this idea is Eb keeping the fact that Lord Raith murdered Margaret from Harry. If he had told Harry about it at any point before Harry's soulgaze with Thomas, Harry would have fought Raith and died. If he had refused to tell him about it in
Blood Rites, Harry would have fought Raith in order to save Thomas and died. Eb was right to keep the information from Harry until Harry had the "insight" from his mother, but Eb never knew about the "insight." My point being that Eb couldn't know that the information was necessary for Harry's survival. Eb's reasons for withholding information were about as solid as they could have been and were still wrong.