Chelsea and some 1900 Bernie Pledged Delegates were led to believe that there'd be a Democratic process at the DNC, but when they got there they found that they had no input at all. Their votes were useless and they were completely cut out of the process, so their only option was to walk out and stage a silent protest at the Media Center, which was also pretty much not reported. There were really no options to protest the unfairness at the DNC. Chelsea didn't pre-plan her protest, it was spontaneous. Realizing she had no other way left to protest she reacted when the opportunity presented itself. If anyone is to blame for bad behavior it's the DNC for using bullying tactics to prevent dissent. I think JFK said it best, "Those who make peaceful revolution impossible will make violent revolution inevitable." Chelsea's form of violence was her finger, which, since were still talking about it weeks later, turned out to be a very effective way to bring attention to the DNCs unfairness.