Purely from a cost-benefit perspective, a revenge-oriented society will make rulers cling to power until the bitter end, meaning that more violence would be needed to unseat them. This is what the 5000 years of Chinese history is all about.
而且，站在純利害的立場，一個報復心強烈的社會，會使一個有權勢的人，寧死也不肯交出權勢，那就必須使用更大的暴力，才能把它摧毀，中國五千年歷史就是這樣。