While I enjoy activity as much as the next guy, having someone like that who's both aggressive and looking to take charge makes me uneasy. Similar to what Rosa said, I've seen towns tear each other apart because a scum got in charge. I don't want to chance that, especially with someone I can't read.
Slight correction: I've seen
towns tear each
other apart in that they tear
themselves a part.
I played in a Discworld themed game (run by Cody) in which the town was so paranoid over our prominent players and people who were active and trying to get others to step up and participate, that no one trusted each other. Townies were consistently lynched at the end of the day. People were afraid to speak up because anything that was seen as leading the town was immediately seen as a scummy move. The townies were destroyed and in the following day it was only different mafia factions and a survivor participating.
Yes, you can't automatically trust people. But the thing is, in addition to reading mafia members you need to be able to read people for town too. This is especially critical for protective roles who will need to be reading people to learn who they should be protecting from death. Which requires you to be able to read someone and decide that they're town and that the mafia sees them as a viable target. People are jumping on Diego for taking the reins Day 1 and trying to direct the town. That's incredibly anti-town and it punishes activity.
Let's even assume for the sake of argument Diego is mafia. We lynch him today and he flips scum. You know what? That doesn't change the fact that he has been acting more pro-town than half the people in the game. He's managed to stir up activity and now we seem to be getting the impression from regular ZDers that DekuNut and JC aren't exactly being consistent with how they normally play. This doesn't mean they're scum, but it does mean we're presenting something new to the game and people are going to have to adapt to it.
Being a good townie player doesn't mean you discredit everyone and write them off. Working together and taking a leap of faith is part of it too. I recently finished GMing a game in which one of our townie players basically allied themselves with the two godfathers and ultimately through the efforts of the town (and protective roles who read said player as town and protected him) brought them to victory.
It is critical that the town works together. It's critical that everyone voices their opinion and what they want to see done. This means having original thoughts and expressing them. People who just don't do anything on Day 1 or folks like musicfan who make a couple of short, choppy posts are not contributing to the game. Considering a number of days have passed I'm going to keep in mind players who want to excuse their inactivity with the Day 1 Shenanigans excuse. Any excuse to not be active or voice your thoughts is scummy.