What sort of reaction would you feel is appropriate when someone builds a bridge incorrectly, and it collapses? "Oh hey, that's too bad, good try though!"? Wh

What sort of reaction would you feel is appropriate when someone builds a bridge incorrectly, and it collapses? "Oh hey, that's too bad, good try though!"? When someone does something horrible wrong and demonstrates that they are incompetent, that needs to be said. Everyone needs to know "this person is incompetent, do not use their work".