Is it acceptable to report private incident of a PhD candidate to the university A PhD candidate has damaged possessions of a flatmate in non-university housing  by purposely dropping their laptop and keying their car.

Is it acceptable to report such behavior to the university of the PhD candidate?

Clarification:
This has obviously been already reported to the police. The question was whether this should be reported additionally to the university. The given US university has a lengthy "off-campus student conduct code". However, a contact is only specified for a title IX coordinator. The guideline does not specify how or if non-sexual misconduct as defined by the "off-campus student conduct code" should be reported.

Clarification 2:
All of us from the same university, but no overlap at all in terms of departments.

Clarification 3:
The remaining flatmates and me decided not to take any university-related action. Nevertheless, the thought that the given person will soon graduate as a PhD and get hired by someone expecting a "qualified" postdoc that will "mentor" students is irritating to some degree to me.
No, it would be inappropriate to report misconduct to a university if the misconduct has no relation to the university, except that the perpetrator was a student.

If the misconduct occurred on campus, involved university equipment/resources, or involved an official supervisory relationship, then it might be reported.