A wrong turn is easier to forgive when nobody pretends they knew the way.

After something goes wrong, a strange revisionism sets in. People remember doubts they never voiced, and the decision that everyone nodded at becomes one person’s error. That leaves the person who chose carrying the whole weight of a choice the group actually made together, which is both unfair and bad for the next decision, since nobody will volunteer to choose again.

If you agreed at the time, say so plainly and in front of the same people who were there. Describe what was known then rather than what is known now. Save the analysis for what the group would look at differently, not for who should have known.