I don't think that's fair.
He didn't admit that.
Yes, that's a plausible interpretation of Butler's idea here, but Butler can also not be malicious or deceptive in what he said, just cripplingly naive.
You can interpret what he said as being that he wants a world where voting honestly doesn't result in bad consequences due to systemic factors.
If he was in such a world, then people telling minor party voters that they were bad or doing bad by voting that way would in fact be anti-democratic and "stifling democracy" by trying to "shame" people into not voting their hearts.
Of course, we don't live in that world, and people pointing out that third party voting is actually counter-productive are being more honest and realistic and trying to do good.
So if you think Butler doesn't understand that, and isn't just pretending to be incredibly naive about politics and the real systemic issues involved, then he isn't admitting to supporting them because they will help defeat Biden, but just admitting to supporting them because he wants a magical pony unicorn world to exist even though it doesn't.
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