Because Bill Hines was stamped with the idea that water is highly toxic.

The Planetary Defense Council's hearing on the Wall Plan decided to open the ideological stamp to the public as a public facility, called the Faith Center. It has only one proposition, which is the belief in the victory of the war. Anyone who is willing to obtain this belief with the help of ideological stamps can use this facility on a completely voluntary basis and under strict supervision, but the scope of use is limited to the Space Force.

Extended information

In order to fight against the Trisolaran sophons' peeping on humans, the people on Earth decided to select four wall-facers. Each Wallfacer independently thinks and designs a plan to deal with the Trisolarans without any interference. Among them, the third wall-facer, Bill Hines, is a British physicist. He and his wife Keiko Yamasugi discovered that the thinking and memory activities of the human brain are completed by quantum processes.

The Hines’ secret plan is to save mankind from escapeism. In order to achieve this goal, they invented a thought stamp machine. People who are stamped with a thought stamp by the thought stamp machine will have their way of thinking controlled. For example, there is optimism about the future of humanity. The reason why thought stamps can be invented is related to the discovery by Hines and others of the mechanism by which humans make decisions—human will is involved here. This mechanism is:

“Let’s not talk about the technical details. Let’s put it simply. In the neuron network of the brain, we have discovered the mechanism by which thinking makes judgments, and it can have a decisive impact on it. Putting human beings The process of thinking and making judgments is analogous to that of a computer: data is input from the outside world, calculated, and finally the results are given.