A developer does whatever he likes, without bothering about the more or less pacific feedback he gets on github. Nobody really seems to want to have a discussion. Well guess then what the “mob” does at some point: they don’t care about discussions anymore either, and they do as they please too.

It's pretty cliche but: Two wrongs don't make a right.

In the FOSS world, there are many ways to handle this kind of situation. A mob-led harassment campaign is not one of them.

If you disagree with how a project is going then you can fork it. LibreOffice disagreed with the direction of OpenOffice and forked it, NextCloud and OwnCloud forked from one another when there was major disagreement.

At no point should volunteer developers have their face plastered on a mugshot and their personal information blasted to a mob of angry people.

Be angry at the politicians and mega corporations who are voting and funding these initiatives, not the developers who are caught in the middle.