When you bad mouth other users there should be, and will be, consequences. An admin got desysoped and banned after repeated warnings? So what? The only ting to be learned is that some people believe they can do whatever they want and it has no consequences, and other people goes ballistic when consequences happen.
I would have given desysoped fram and 14 days to cool off, and if that did not work out repeated with one month. Banning someone for one year is like telling them to leave and don't come back. Someone at WMF is clearly overly sensitive, but not reacting would also be wrong.