Why do people feel they are entitled to do what ever they like?

Now that's a mystery. I'd love to know the answer to that because it wreaks havoc in my life almost daily. It's incredibly inconsiderate and soul destroying. It also comes packaged with lies and denial. People that behave like they have the right to do what ever they please should stop to consider the effect that there behaviour is having on the people around them because it is extremely annoying and frustrating. I could complain for hours about this sort of inconsiderate behaviour but I wont. Instead I will just ask nicely "Please Please Please stop being so inconsiderate".