This is a very short thought, because a lot has to remain unsaid.
The trouble is that we are sometimes too polite for our own good. While yes, being polite is what keeps our society sane and healthy, it is the same thing that sometimes hampers us from moving on.
So there is a limit to being polite and nice. “Do you think that I have come to bring peace on earth? No. I have come to bring fire on the earth, and would it be that it would already be blazing!”