Grok is a hosted service. In your analogy, it would be like a gun shop renting a gun out to someone who puts down "Rob a store" as the intended usage of the rental. Then renting another gun to that same client. Then when confronted, telling people "I'm not responsible for what people do with the guns they rent from me".

It's not a personal tool that the company has no control over. It's a service they are actively providing and administering.

Would you blame only the users of a murder-for-hire service? Sure, yes, they are also to blame, but the murder-for-hire service would also seem to be equally culpable.

Except in this case someone else owns the gun and they allow anyone on the planet (with an X account) to ask for someone else to be shot at will.