This assumes that all users are informed enough to make such decisions.

You cannot expect the average player of an online game to have the technical knowledge necessary to discern whether a piece of software is safe to use or not. Even if you could, you'd also be expecting them to take the time to do a proper analysis of such software, which I do not think is a reasonable premise.

What's more, this is open-source software we're talking about and you can actually relatively easily perform meaningful security checks; imagine if this were not the case.