What happens when you cram 300 people in your backyard for a BBQ - Of course someone jumps off the roof into the pool. The airlines are at fault for not maintaining a higher standard of passenger comportment and dress. The passengers are at fault for thinking an airplane is just like a local city bus.
The pursuit of ever increasing profits for investors has created an industry that won't stand up to those passengers who have no business being in close proximity to others at 35K feet - these people don't know how to control their emotions, deal peacefully with others, and basically just can't sit still and quiet for 4+ hours. The passengers who think the rules are for other people - my carry on the is the size of a Volkswagen but that's ok, my 8 hour old newborn has just as much right to fly as does your support anaconda and that annoying seat belt sign is just a recommendation - I have to go to the bathroom now, before take off, because I downed 15 coffees and a beer in the airport waiting for boarding.
Trouble makers need to be banned from flying for five years on any airline for fighting, being disrespectful or for just being lousy human beings. 2nd offense sees these idiots banned for life. The bar for expected behavior needs to be seriously raised and a jacket & tie, and long skirt just to check in would be a good start at weeding out those who are unable to see past themselves in their own minds eye.