GP didn't suggest to reject reality out of concern for others. He said we should make sure to be 100% certain of what the facts are before asserting what reality is to the public, especially when it comes to sensitive subjects.

The alternative is to say that reality is A, have a lot of people face (just or unjust) repercussions, then say "Oopsie! Turns out we were dead wrong". The damage is already done by that point.