This was an ideological fork. Let's not pretend otherwise.

What would be the ideology behind it? Ninja mine is fine as long as it is not a threat to the witnesses?

The Community™ can't take the moral high ground here. They were OK with it for 4 years, only when that stake presented itself as a danger to their power they forked it out. What's worse, that blacklist looks like something a vindictive child would make.