Confused and lost on the highway of life

Black Friday was yesterday and I had no interest in partaking in the madness. Watching the news had me thinking...why on the day after thanks do people get so greedy and want more...Weren't they just thankful for what they had? But then the shopping craziness is for holiday gifts for others ...right?  Seriously though....is that REALLY inexpensive gift for a loved one worth slugging someone...of even worse. Do perfectly normal people lose all common sense and decorum of decency just because of a sale? I would like to believe that normal, sane people don't go crazy over sales.  Unless the sales bring out those people that have a true violent and selfish streak, that makes more sense to me.