"I do not agree with your opinion, but I will defend to the death your right to express it."

Here is my question. Why should they defend to the death? When you show no maturity, no responsibility, no intelligence and careful thought at arriving at your opinion. I read somewhere, "must they sacrifice everything, and you must sacrifice nothing?"

And I believe it applies in this situation as well. Why should they take all that responsibility to defend you, when you are not taking any responsibility in the way you act, and present your opinion?  no caution, (necessary precautions, preparations) (show no discretion in choosing your actions)