If Andrew Lee simply wanted to destroy Freenode, he could have just pulled the plug on the domain name and/or shut down all the servers. It's clear, however, that he wants freenode to continue operating, just under his control; which means he has a reason why what he's doing is the Right Thing to do. Which means all the people advocating that their channels move over to Libera are either deluded or evil and are destroying communities. So in his mind, he's fighting the Bad Guys by seizing control of channels where the Bad Guys are abusing their privileges to destroy communities.
I mean yeah, it's easy for an independent observer to see that it's actually him who's abusing his power, and that those attempts will be counter-productive. But he's not an independent observer.
We've all got a thumb on the scales when evaluating our own behavior; its just more noticeable in a situation like this, where the thumb is more like both arms and a foot.