People are very selfish: Why

Don't you think people are so selfish? They never think of anyone except themselves.  The worst thing is they love to blame YOU. 

YOU ARE THE ONE WHO CAUSE ALL THESE PROBLEMS
YOU ARE THE ONE WHO MAKE THE SITUATION WORSE
YOU ARE THE ONE WHO DON'T LISTEN TO ME

You know whats the most important to be a better person?

Self Evaluation

Self Discipline 

If you do some research about yourself, you will grow your mindset and value. However, no one is doing that now. They think they are the best, they think they don't need to be change and they think they don't need help from others. Therefore, they won't have time to evaluate themselves!

Self discipline is the most important aspect in life. However, no discipline seems to be a style nowaday! You will look cooler if you knock out a guy or you look cooler if you bitch out a girl. People never think about consequences. In fact, some people don't think they are wrong. It's scary if it gets out of hand!

At the end of the day, people are selfish no matter who they are.  They only care about themselves,  no others.