Partys do not get out of control. People get out of control and should be punished accordingly when they endanger persons, property, disturb the peace, or commit other acts contrary to various laws or ordinances.
Mr. Hershiser owns the property but did not serve alcoholic beverages to Brady Marlow. Brady Marlow, all by himself, made the choice to have a party. Brady Marlow is twenty-one years of age. Brady Marlow is an adult; old enough to vote. It is for Brady Marlow to bear the consequences.
As the owner of a student rental and a citizen of Kent, I recognize what can happen when SOME students party. The vast majority exhibit self control.
Of course Mr. Hershiser "knew this could happen." Anyone who rents out property knows it could happen, whether the tenant is eighteen or sixty. You are holding Mr. Hershiser guilty of "he knew this could happen."
This sort of thing is covered in my lease, and should the situation arise, I WILL evict.

I don't know Mr. Hershiser or what kind of landlord he is, one who cares or one who doesn't . My own personal experience has been with the ones who don't most of which didn't even live in Kent. One student rental property, three houses down from my parents, was spewing raw sewage out of a clean out that was put into the pipe that ran from the house to the street, which eventually caused the sidewalk to collapse. It was reported, nothing was done not even sure if it's fixed now. There are a good number of landlords that do care, and those are the ones who get hurt by this ordinance, not the ones who only care about the rent they collect each month. If he is one who cares I hope he is able to evict Brady Marlow, I also hope he is able to recover any damages that may have been done to his property.