Bullshit. This is called a "tu quoque" fallacy.

If you go into a brokered convention, you'll be handing Trump the win. The vast majority of voters aren't tuned into politics and won't watch the convention.

If you were sincere, you'd have a name. Attacking the candidate without a viable alternative is transparent FUD. Prove me wrong, though. Name someone who is both viable and has declared interest in the job.