阅读材料，回答问题：

材料一 在绝对意义上，20世纪发生的集体暴力比过去十个世纪发生的还要多。在1900～1999年之间，世界上爆发了250场国际的和国内的新战争。大约1亿人直接死于由政府支持的、由军事单位组织的集体暴力，故而蒂利称20世纪为“暴力的世纪”，霍布斯鲍姆则将1914～1991年人类的历史称之为“极端的年代”。                 

——摘编自闾小波《从对抗到和解》

材料二 二战结束60年了。虽然这60年中世界并不太平，各种暴力冲突和战争依然在威胁着人类的和平与文明，但大国战争已然远去。……二战的战争规模和破坏能力达到了人类战争史上空前的规模，二战期间人类军事技术的革命性变革，例如核武器的产生和发展，已然揭示了战争前所未有的文明悖论：如果新的世界大战再度爆发，人类将可能无法从战争的摧残中恢复。

——中国日报网《二战启示：世界和平依然任重道远》

如图漫画主要启示我们，在“行为前”要（    ）

    A well-dressed man goes into a restaurant one day. He sits down at a table near the window. A waiter comes up to him and says, “Can I help you, sir?”

    The man says, “Can I see the menu?” “Certainly.”

    The man wants a good meal and he wants a lot of nice dishes. The waiter gets them for him. The man is having his meals. At this time, a boy comes in and sits beside the man. He asks the man to give him an ice cream. The man does so.

    Now the boy is eating his ice cream. The man says, “I go out for a newspaper.” The man goes out.  After the boy eats his ice cream up, he stands up and goes to the door.

    “Excuse me. Your father doesn't give the money for the meal and your ice cream,” The waiter stops him and says.

    “Father? You are wrong. He isn't my father. I don't know him. I meet him in the street. He says he will give me an ice cream if I come here at 12 o'clock.”