Why do we search for a meaning in life?
I assume that religion arose because of the desire to give meaning to life. Maybe this prerequisite is already wrong ;)
Since we do not know what is the higher purpose, but still searching for it, I assume it is a strong desire to give live a certain meaning. Maybe this assumption is again not true for the majority of people and only my subjective impression.
Since no one found 'the' meaning of life' so far, but we are still trying to find it, I assume it is difficult to understand that there are things without a higher purpose.
Edit: People might argue that all bad things that happen to us will make us think about the 'meaning of life' question. But I will not accept this for an answer ;) because there are also good thinks that happen to us.
No good things without bad things, so who wants to be happy needs to know sadness. Therefore bad things exist to make good feelings possible. Again a purpose question, why is it just so important to us ;)