Under normal circumstances no, I would never try to physically attack someone. However, these people aren't under normal circumstances. Have you ever felt like your entire world was ripped from underneath you? I have twice. I lost my son in July of 2003, and this past March... well... let's just say that someone really hurt my 3 year old little boy. I felt like I had no control over anything in my life, and like nothing was ever gonna be the same again. During a stressful time like that, and some of these people are going through much worse (lost loved ones, lost homes, lost jobs, they've lost EVERYTHING), it is very difficult to keep your emotions in check. The smallest thing can set you off in an extreme way. You may try your best to keep things under control but sometimes you just kind of lose it, over some of the dumbest things too by the way.
I am usually a pretty calm person, who avoids all altercations if possible. I was walking through the mall a few days after my son died looking for an outfit to where to his funeral and accidentally bumped into someone, I said I was sorry, and she decided to call me a few words I can't post here. Well, guess what?! Something that stupid almost came down to blows. When you are at your wits end it is hard sometimes to control your temper.
All I am saying is that these people have been placed under a significant amount of stress, stress that most of us could never even begin to imagine. So instead of talking about how horrible they are for reacting the way that they did, maybe we should just try and be a bit nicer.