Excellent question my friend.

My view on this, which is already expressed previously, self-centered. The feeling that they are more important than everyone else around. Thus creating a chain-reaction that they needs to get where they're going faster than you.

How they were brought up is the second factor. A person who grows up watching their parents cut queue will have a pre-installed mind that it is not wrong to do so.

Third is education. From house of school. Both plays an important part in this. You don't need a Degree to have common sense. So this relates back to the first factor.

On the religion side, I personally think it is sinful to cut cue. Why I say this? In Islam, you are told not to hurt others (physical/mental/emotional). So when you cut cues, people will be hurt and thus a free sin for you.