In addition to all the below..by design a bunch of 18 year olds are suddenly out of the family home in some form of work or tertiary education, and we keep shunting the 'here's a bunch of painful lessons you learn as you get older' further into people's lives, when they are more catastrophic.
i really hated crash. the movie has the same tone as watching a peasant get burned alive for sodomy. taking pleasure from casting judgement upon perceived deviance as a way of vicariously enjoying said deviance