The officer said he "didn't tell her to leave." That was TECHNICALLY true, but he DID tell her to "walk on," which is taken to mean that she should leave the area. Basically, what he did was encouraged her to the leave the scene of a crime, which is illegal. Thus, he encouraged her to perform an illegal action without first considering if the owner of the property wanted to press charges.
I understand wanting to de-escalate a situation, as that is their job, and I appreciate them doing their job. Whether the police like you guys or not, they're keeping everyone safe, including you all; however, he didn't do what was right in that situation. Hopefully, we can have understanding with him, as those types of situations are not necessarily a daily thing for police officers, and sometimes, even they get taken back by how people act, but the main point is that he did not confess that he initially took the wrong action and said the wrong thing.