It's a South of the Border tradition too... one of the guys who used to work in our office when I was in the LA area lived down in Santa Ana and it got so bad there at New Year's and Cinco de Mayo that he just planned his vacations around the holidays so that he and his family wouldn't be home during the celebratory shootings. lol The other "tradition" was to repair the roof the following weekend.
Hopefully he moved... NOT someplace I'd be happy living.