So you are equating politeness with not halting bad ideas. That is not politeness, that is incompetence. Competent people would halt bad ides, but it can be done in different ways:
- Abrasive: This idea is the dumbest ever and you are an idiot that deserves to die.
- Constructive: This idea have problems X, Y and Z.
- Polite: Thank you for the effort, but I see problems X, Y and Z with the idea in its current form.
A lot of the discussion here is confusing the question of competence with the question of tone. You can be competent and have a nice tone and you can certainly be incompetent and have an abrasive tone. I can understand not having the patience for politeness, but personal insults are obviously counterproductive.
- Abrasive: This idea is the dumbest ever and you are an idiot that deserves to die.
- Constructive: This idea have problems X, Y and Z.
- Polite: Thank you for the effort, but I see problems X, Y and Z with the idea in its current form.
A lot of the discussion here is confusing the question of competence with the question of tone. You can be competent and have a nice tone and you can certainly be incompetent and have an abrasive tone. I can understand not having the patience for politeness, but personal insults are obviously counterproductive.