Friends who know the law come to help.

First of all: this tree is beside the shared fruit farm, so whose tree is it? Is it your father's, your father's friend's, or the original owner of the fruit farm?

Secondly: if it is not owned by your father, according to you, your father may be suspected of theft. A criminal case is a case in which public power intervenes and acts as a prosecutor. The parties can't settle the case privately, that is to say, once the public security department thinks that there is a possibility of suspected crime, even if the victim doesn't ask for tracing, the public security department can completely continue the investigation. So according to what you said, it is not illegal for the police station to refuse to withdraw the case, which is in line with the law.

Once again, if the police station does violate the law during the investigation, it can complain to the public security bureau or the government.