There is no answer to the question why but to say that it is because that is the way it is.
The game of the question WHY and the given answer goes on and on endlessly repeating itself and each reply gives rise to another WHY?, this is a play of the mind to keep its continuation because if that ends so does the one that believes it needs a reply to its question.
Once this is seen clearly the dropping away of interest in the WHY takes place and also the interest in the reply, when this happens one dissolves and only this, existence, is with no one that exists to question why it exists.
This then is sufficient.