On MrV's principles
MrV gave up hours of his life every day for 8 (?) months in order to help develop emunie for free.
When he realised that the developer was unworthy of his trust, he threw that all away to follow his conscience.
He now finds himself in possession of damning material, showing the developer as he truly is which is obviously relevant to prospective investors. He decides to publish this material knowing full well his ex-colleagues will react just like they have.
I don't think it's MrV's integrity which is in question here.