It may seem impolite to criticize someone else's parenting choice, but every once in a while, it's necessary… especially if other people are being impacted by said choices. Here, we have a 40-year-old entitled Karen who, along with her two kids, was taking up seven entire seats on the train. This would not necessarily be an issue if it was a quiet, empty subway car. However, in this particular situation, there were more folks who were standing than sitting, including several elderly people who…