As the saying goes, to kill a snake, you must strike at its seven inches.
To deal with someone, you have to attack at their weakest point.
The weakest point of Li Yougui's parents is welfare!
These two were in violation of the rules when they received welfare.
All Wang Dahai needed to do was to tell them he would report them, and that would scare the crap out of them.
Seeing their reaction, Wang Dahai knew he had achieved his goal.
As for calling people over to teach them a lesson, to flatten their house.
It was just to intimidate them.
In times of peace, violence can never be taken to the stage.
Although it's equally effective, it can easily get oneself into trouble too.
Wang Dahai snorted, glanced at his watch, and said, "Fine, I'll give you all some face."
"By twelve o'clock, if that person doesn't show up, I won't just flatten your house, I'll go directly to the authorities to report your welfare fraud."