Because prior to speed revealing there is no thematic split it would have been by far the most reasonable assumption for Zemo to be mafia/TP.
Which is totally unreasonable hence why I FOS you.
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Protagonists vs. antagonists is only a reasonable possibility if you exclude every other possibility. For instance, a Cap vs. Iron Man split would be reasonable. Also, we knew that Speed didn't do a theme last time, so there was no reason to assume that there would be a theme at all. Your logic only makes sense if you exclude every other possibility, even though you have no reason to exclude them.
And idk if you've been explain this before but in a game of mafia everybody is GUILTY until proven innocent, and someone who's even 40% likely to be scum is more likely than average and thus is a good lynch target. So there would have been no reason for you to defend him unless you had inside knowledge.
Except for the simple reason that he will confirm himself as either town or scum within two DPs, so it is more reasonable to just wait until those odds increase to 90-100% and search for other likely scum in the meantime.
I just opened up DP1 of that game, speed says right in the OP that there are no villains, there is no theme split, and all the players are heroes.
Which didn't stop players from assuming that there would be a theme anyway.
He doesn't say that in the OP of this game. So in fact the absence of immediate clarification would have been evidence to the theory that there IS a thematic split this game.
Except that he is an inexperienced mod who is prone to making that kind of mistakes.
All of your logic here relies on throwing out every other possibility with no reason to do so.