"It's just disappointing. We think it was a rogue element - probably local. It is sad."
Mr Wilson said his staff had been abused by a local motelier who was angry at the race cancellation.
He had received a text message threatening to kill him along with several other protests.
"It's really shaken my family but I'm fine so far... I still hold the view that the race needs to move to a different site."
Police had been notified about the death threat and graffiti attack, Mr Wilson said.
Ohakune Giant 1000 organisers had disassociated themselves with the actions of the person who left the deer head, he said.
"We're still hoping we can work together. We've never been opposed to a rally - just the site."