Nothing in this world has got no purpose.
When something has no use to us at that time, we always refer to it as "futile". We say this because that's what we see and think at that moment. When something has no use to you that time, it doesn't mean it will always be useless for ever.
If it doesn't help you or benefit you, it benefits others.
Therefore everything that you see in this world has a purpose, it may benefit man or animals.
How do you vote?