The root cause problem seems to be that people who are highly intolerant to others' views and perspectives that they happen to disagree with have become an outsized voice in tech circles. Shunning, blacklisting and publicly denouncing has become a toxic norm.

Justine has expressed unorthodox views in the past but that's no reason to punish him forever, or indeed at all. To be as inclusive and tolerant as possible - towards an end goal of maximizing participation and enabling outstanding technical work to flourish - it is better to simply agree to disagree.