Sorry, my argument about the extraordinary claim was against the poster who was downvoted, not you.

I'm not sure what a "valid" moral theory is. What I do know is that he made a claim that no reasonable person that I know would agree with. And provided no evidence to back it up. This is trolling. When you say that Wiles proof of Fermat's Last Theorem is wrong, with no evidence, that is trolling. When you say Ruby is strictly superior to any other programming language, with no evidence, that is trolling. When you say that taxes are morally wrong, with no argument for it, that is trolling.

And trolling gets people downvoted. That's my argument against you. :-)