why the people to like to do bad things?

- A person has low ethical standards or insufficient ethical education.

- A person is motivated by their friends, to be cool in front of their friends in order to stay "in group".

- To prove one's abilities in front of one's friends.

- A person may see other do bad things without being blamed (such as taking office supplies home).

- Their desires/goals/targets/missions might not be accomplished without doing bad things.

- Because of the benefits offered / received.

- For retaliation because one may be hurt by other.

- To stop one being success.

- Temptation.

- sometimes people do bad things becuase their eyes are clouded.

- Corrupted by their friends or anyone one hangs out with.

佢地心理上有問題！

This is because people will never get what they deserve, so whether being on the dark side or not, is pretty much the same as a righteous man. And at a certain point of life, things change to trigger how one behaves.

小偷:因為他們貧窮，想賺快錢。
殺人:因為他們對別人有仇恨。

it is because the bad things is more cheaper.

Because people are bad in fact .