Have you ever asked someone why they did something and they responded with "no reason?" Did this make you puzzled and feel as if there had to be a reason so you asked them why again? In The Stranger, this reaction is described as society's refusal for irrationality. Society needs there to be a purpose to life and a structure. Society falls apart without these. It even destroys things which it does not understand could have no meaning in order to stay together.
In The Stranger, Meursault lives off his basic needs. He sleeps, eats, and has relations with a woman. Meursault does things for no other importance than to live each day. He killed a man, but was judged based on not crying at his mother's funeral. Because of this, Meursault was executed. In today's society, people are still judged by their motives or reasons. One big thing that is still not understood by society is how people can be homosexuals. Society tries to explain it with science saying it is their genes or with religion saying that they are possessed by demons. Parents tell they're kids they are just in a phase. Others say they decided for themselves to be gay. Some try to say that bad experience with one gender led them to another.
What if the real reason is that there is not one? They did not make a decision, it just always was. It was not always because of some genetic decision either. It could be just another absurdity. Something that can not be explained because there is no explanation. We choose our own meanings to make sense, when in actuality there could be no sense.