Twitter is a platform for mobs of every sort, and if you have a mob of followers and you attack a colleague, publishing his contact info, you are de facto encouraging the mob to attack him, even if you play dumb after the fact.

There was no attack on a colleague (a public disagreement is not an attack). The person who was fired has less than a third the followers of the other person (and probably very significant overlap between the follower groups). There certainly was no publishing of contact info, unless you consider all public mentions on Twitter to be publishing contact info (which is preposterous). Your impression of what happened is mistaken.

You’re performing impressive mental gymnastics to say this person’s behavior did not harm psychological safety.

Instead of trying to prove there was no harm, and that being a maintainer of an open source project should make it okay if people do this to you.. think about the intent of what this person did.

Did they intend to create a safe environment? Or did they intend to bully someone into seeing their view, and doxed them on Twitter. A view that the original tweeter identified as political!