Yes, isn't fantastic to be crew on an SLS. But what's the purpose of crew when all is automatic? What shall the crew do aboard an SLS? Plant strawberries on the Moon?
Orion is to be lobbed around the moon, while attached to the gateway station. Gateway is filled to the brim with science experiments. A lot of them are automatic, but you can only do so much with automation. So they need people to run those experiments.
This is also why there are people on the ISS.
The other reason is to test medical science, which you cant do with out warm human bodies in space.