Tarbell Can't Run as a Write-In Candidate

I never knew it was Ohio law that individuals who try to get on the ballot, but fail, can't run as write-in candidates. I don't know why this would be needed? What is this law trying to prevent? If you failed to get on the ballot because of fraud, then sure, I see why you should be a write-in candidate. If you just turned in signatures and didn't get enough, why should you not be allowed to file as a write-in candidate?