While I am not town-reading Weak or trying to defend him, but I find what you said in bold interesting. Let's take a look at actual response Weak mase (look quote below). I find his reason points valid at least better than the reason for voting against Infected, even though the sentences was a bit messy. Also, to your "Why was he trying to save you?", look in the bold and tell me if I missed anything.
Weak did not include a response to your points, which I do find very poorly done by him. However, I did find your response weak. I do not see how weak defending Infected could make Infected a "head mafia", and did not see how anything Weak has said made him trying to bring attention away from both Infected and himself. He is doing the opposite, especially with his "we lynch inf, then igg" idea.
Sure, say that I am defending him, but I do find it interesting that you are trying to make him more suspicious, stating he had no good points and just town-read Infected, and asking questions which he just answered in his paragraph if you were paying attention.
