Thanks for this great article!

I have a super nerdy poindextery question. I teach logic. Is it really the case in your field that an opinion must be supported by a valid argument? Valid, for logicians, is an argument in which, if the premises are true, the conclusion must be true. That's an incredibly high standard. No inductive arguments are valid. In logic. But the word 'valid' is equivocal across different fields. How are you using the word? Just curious.