Um, no. Why would it be their responsibility? There are laws regarding IP theft. If you willingly break them you can't just say "well your security wasn't good enough".
There's really no way to prevent an employee from taking a piece of paper or a digital file from one place to another. The most you can prevent is accidental transfer. If they are malicious they will find a way no matter what guardrails you put.
Huh? This analogy makes no sense. It’s beside the point anyways.
The utility of laws isn’t in stopping something from occurring, it’s in establishing remedies for when they do. Someone illegally transferred IP to a competitor that had knowledge they were stealing, and now Apple is seeking their remedy.