Why do you think some people take advantage of others?

 Why people do take advantage of others? Maybe because of our own different personality or attitude.. We know that each person has a different personality, likes, dislikes, wants and everything. They just observe first those people who they want .. We just need to observe first :) Because not all all people in just a one click could be friends but there are some.. Or maybe because of their selfishness that they had to take advantage to other people, they want to own a thing for their self interest. Maybe that's the reason why they take advantage of others.