A short resignation email on a mailing list is about as little drama as I can imagine for, well, resigning. Perhaps by "drama" you're referring to the linked video, but watching the clip, the only drama I see is accusations like "You're trying to convince everyone to switch over to the religion as promulgated by Rust." Regardless of the technical issues, that's an ad hominem with zero technical merit.
Yes, he was pushed over the edge. But what he said is not a lie.