First of all, the person who faces the wall does not know in advance that the close person is the wall breaker. For example, the professor, the third person who broke the wall, had no idea that it was his wife who broke the wall. In that case, what's so strange about letting the broken wall near him? Second, the plan that the broken wall people came up with is what they think is the best and the best plan. The plan failed and they couldn't think of a better one.
Analysis of those who break the wall of human face
Those who face the wall are thinkers of human position. Because they are monitored by proton robots of three-body civilization anytime and anywhere, they can't talk to others, so as not to be seen through the rebel plan. They can only think for themselves, which is equivalent to thinking on one side.
The broken wall man is a human thinker standing on the standpoint of three-body civilization. They are responsible for destroying the plan of breaking the wall with the help of proton robots, so that the three-body civilization can successfully occupy the earth.