I think what happend in Toronto over the weekend is a lot like what happens when a teenager's parents are away, and the kid organizes what he thinks will be a fairly intimate, containable gathering that, once word gets out that there's a party, attracts all the wrong sorts of people and quickly spirals out of control. (How many times have we seen that scene in the movies?)
Now that the party's over (it's time to call it a day/They've burst your pretty balloon and taken the moon away) who should pay for the damage? Insurance companies? Or the guy (what was he thinking?) who foolishly insisted on having the party?