Why would the Three-Body Civilization attack Earth in the Three-Body Dark Forest?

According to the novel, the Three-Body People thought that humans knew the law and could use it to threaten the Three-Body People to give up the attack. In that case, why waste their energy?

Answer 1

In " Three-Body II: Dark Forest ", the reason why the Three-Body Civilization attacked Earth was because Earth had become a " market " for the Three-Body Civilization.

The civilizations on every planet in the Three-Body Galaxy would try their best to obtain sufficient resources and energy to maintain their survival and development. Therefore, the various planets in the Three-Body Civilization had established an inter-dependent relationship. This relationship was called the " Dark Forest Law."

The Earth civilization was also aware of this and tried to express their existence and intentions by sending signals to the Three-Body Civilization. However, because the Trisola Civilization had already detected all civilizations in the universe, they knew about the existence of Earth and considered Earth civilization a potential threat. Therefore, Earth's civilization was seen as a " market " by the Three-Body Civilization and became a " prey " for the Three-Body Civilization.

The Three-Body Civilization believed that if they did not destroy Earth's civilization as soon as possible, Earth's civilization might send more signals to other planets, causing other civilizations to discover the existence of Earth's civilization, which would lead to a greater threat to the Three-Body Civilization. Therefore, in order to protect their own survival and development, the Three-Body Civilization decided to attack Earth.