Why is Grassroots Administrative Law Enforcement Difficult in China?

Putting interpersonal relationships aside, the main problem is the imbalance of responsibilities, authority, and benefits—more responsibilities, no formal establishment position, and poor pay, which leaves little motivation to do a good job. Moreover, the cost of law enforcement is high, further burdening townships that already have meager fiscal revenue (so in most cases, handling matters involves mediation and turning a blind eye).

Taking the example in the article, dealing with a pothole issue before and after law enforcement can cost tens of thousands or nearly 100,000 RMB, while fines might only be 10,000 to 20,000 RMB, and sometimes the money is withheld by higher authorities. High enforcement costs ultimately lead to downgrading serious issues and resolving minor ones quietly.

With enforcement powers delegated downward, why can't the grassroots "catch them"?