Why should we validate in creating method?

I'm trying to understand the decision of call the validator in create method:

https://github.com/andersao/l5-repository/blob/master/src/Prettus/Repository/Eloquent/BaseRepository.php#L619

So far as I understand, is not the responsibility of create method to validate something.
And if we already call this:
```
$this->validator->with($request->all())->passesOrFail(ValidatorInterface::RULE_CREATE);
```
In the controller action, why should we repeat the same in create method?

In my point of view that's annoying, and I can't change the data after the validation in controller and before the create method.

Well, just clarify my blur point of view please.