"Tree down up!" is perhaps my favorite road warning yell. Of course everyone behind knew exactly what I meant.
I have never yelled "Tree down up". When there's a tree down blocking the road/path, I yell "STOP" or "STOPPING".
Perhaps the best way to understand why people say what they say is to pause after saying something and ask yourself, "why did i say that?" If the answer is that you are always logical and reasonable, have no cognitive biases, and empathize with everyone, then you are very unusual or more likely incorrect.
I never claim to be perfect; I just don't think defending someone for doing the proper thing makes me or anyone else, "always logical and reasonable, have(ing) no cognitive biases, and empathiz(ing) with everyone".