Alright so either it's a useful piece of information and then it's useful to scum, or it's not and then it's not useful to anyone. There is no sweet spot in the middle where it somehow becomes useful to town.
Look, town can either play as a bunch of individuals keeping everything as close to the vest as possible or as a team pooling information and insights in order to make better decisions as a group. Doing the latter surely gives scum more information, but it also allows town to, you know, play a team game as a team game, work together, learn from each other, and generally improve the quality of their guesses. Whether the opportunity for town collaboration outweighs the opportunities for scum sabotage is, sort of, the whole game.
But to say that you should never share information that might be useful to scum is to say that you should never share information, which is clearly absurd. Even if we decided we wanted to play this game as a bunch of non-collaborative individuals, then we would face the problem of there being no discussion from which to source the information that allows us to make an informed choice.
So, we disclose and discuss our reads.