It seems the person who resigned here was on the Rust core team, and had been involved in Rust for quite a long time ( https://internals.rust-lang.org/t/announcement-jonathan-turn... ).
In no way defending the sloppy conference planning or how the former keynote speaker got screwed here, but...unless I'm missing something it seems pretty disproportionate to completely leave a community you've invested over seven years of your life in over sloppy conference planning, doesn't it? I feel like I'm missing something.
Not sure how I’d react in his exact situation, but once trust and mutual respect are gone, so am I.