Yes, mistakes, misery, laundry, everything has a purpose. But,
If everything has a purpose, then a purpose too will have a purpose, and so on ad infinitum. [Paradox of Purposes]
So, does there exist any thing to which we can point and say, I understand its purpose. Because to understand its purpose we have to understand its purpose’s purpose and so on. The possibility of a definite purpose can yet exist if we can establish that this series of purposes, of an object or an event, is a convergent series i.e. each subsequent purpose keeps getting smaller and sum of all these purposes is a finite purpose. But then, the present purpose is the one which is derived from the subsequent purpose. So, the following purpose is the one which keeps getting bigger i.e. the Higher purpose. It surely looks as if it is a divergent series.
You see, the purpose of this keyboard is to type. The purpose of typing is to communicate. The purpose of communication is to establish relationships. The purpose of relationships is to bring misery. The purpose of misery is to create balance. The purpose of balance is to make things go longer. The purpose of anything staying longer is to, well, i don’t know.
By the way, that’s a nice insight i.e. We write to create balance.