I'm not a Black Friday type person, but people are so judgy, judgy toward the people who are. For some of the Black Friday shoppers, that IS how they spend their family time and it's been a family tradition long before it was labeled "Black Friday." Sure, there are crazies out there, but there are crazies everywhere.
We also need to consider the fact that not everybody likes their family, so, there's that.
Some Black Friday shoppers just have such competitive personalities, that they can't help themselves. So, shop on, you crazy diamonds (Pink Floyd reference). I'm staying in my pajamas.