Utilitarian does not believe that common sense is right. It says that common sense cannot be trusted. First of all, common sense rely on an individual's belief; for example, how people treated women and black men in the past. And as we all know, people's beliefs changes over time but utilitarian is very serious and strict. The idea will never change no matter how long the time has passed. Moreover, common sense allows us to have luxury lifestyles without bothering to use our money to help other poor people. However, in utilitarian, you must choose to help poor people so that its fair for everyone. Utilitarian doesn't allow us to live a selfish luxury life.