Is there a contradiction between the harm of karma to future generations and the reincarnation of karma? How should this be understood?

There is no contradiction. First of all, cause and effect are connected for three generations, and the disaster brought to future generations is only superficial. People who are not blessed can't be born in a blessed family, so it's a disaster for their children and grandchildren, but everyone has different karma, so they have to suffer it themselves.

Lv Zu's Causality Theory in the Third World mainly talks about: first, human life is made by oneself; The second is how to make yourself live a good life; Third, the law of karma for doing good and accumulating virtue and doing evil. Causality refers to the cause and effect of things, what causes are planted and what fruits are produced, and what fruits are planted and produced according to religion.

There are three kinds of karma: present report, good and evil report, and bitter and happy report; Life newspaper, or past life homework this life newspaper, or this life homework next life newspaper; Quick report, immediate homework, immediate report.

Causality is a great furnace for the world to be a saint. If cause and effect are not investigated at the beginning, the whole religion may have wrong cause and effect after teaching. If cause and effect are wrong, there will be some depravity, and there will be no reason to rise. Let's not say that this reason is shallow and sudden! When the Tathagata becomes the Tao, all beings fall into three paths, and there is no cause and no result. (Reply to Sichuan Xie Jushu)

People who study Buddhism should start with a careful understanding of cause and effect. If you can be cautious and independent, then your evil thoughts will be clear. Why is it worse than law? If so, it will be true when the troops are ordered to stop. Otherwise, learn and walk. The higher you know, the lower you go. Today, this study of Buddhism calls itself a big scar on the family. (Reply to Chen Boda Jushi II)

There are people in the world who advocate (publicize) high-profile things, people who like to listen to karma and practice hard, and people who only use everything as amulets. And I don't know that everything is empty and nothing, so it doesn't mean that everything is empty and nothing. What's more, he used it to cover up the traces of laziness, not to do things with truth, but to fight for heights with empty talk. When karma is ripe, Yan Lao should support him and respect those who have nothing to do and nothing to do. When I was in Sri Lanka, I didn't know if I would be free. Stay away from such people, so as not to get the support and respect of Yan Lao. ("The Book of the Later Zhou Folks")