We don't have that evidence, we have Inf being a hermit and thats it. But if you truely believe card = alignment then give me a good reason why we should not massclaim right now?
You said that we would have that evidence, and we do. It makes sense that a hermit would be a third party, just as it makes sense that a card revolving about destructive change would be anti-town.
We should not massclaim as there are only three cards that are obviously evil. I would lynch off those three without blinking an eye as I firml believe that alignment is linked to cards. However, what do we do after that? The mafia can just whittle down the town's useful PRs by guessing which cards would have which ability. After the three scummy cards are dead, who should we kill after that? While the moon and wheel of time / judgement (whatever it is), could be mafia, we don't know and it is not obvious, unlike the other three so I would be hesitant to lynch them just for their card.
And no, this is not me contradicting myself. The Devil, Death and the Tower have obvious negative traits attached to them and are almost certainly scum (IMO), but the other possible mafia cards are not so obvious and so I would be reluctant to lynch them for that reason alone.
We can always massclaim tomorrow I guess, but to do it today would be ludicrous as it would just give the mafia an extra night to wreak havoc among our potential useful PRs. We have one scum card exposed, whose claimed ability is only loosely linked to the card and meaning, so it is much better to lynch this person now, as opposed to exposing every single town useful PR to the mafia.
Lynching notty would also bury the hatchet once and for all in my opinion, get rid of any little bit of doubt that might remain, that cards are linked to alignments.