I believe the answer is simple. Mr. Whitbeck stole the list, which is not his personal property, and used it for his campaign. This belief is conjecture. The committee may have given the list to both candidates, and to Joe May for that matter, but we know how these things work. These lists are golden and they are heavily guarded.
The committee can do what it pleases about the alleged theft. My question is, what do you suppose the value of that list is? The email was sent on December 5. The GOP mass meeting is December 16. Can Ron Meyer, Whitbeck’s opponent, compile a comparable email list in time to counter the outreach? I don’t think so.