Nice try. But no, the more likely cause is the observed pattern of left-wing thuggery from the 'Yes' [or else] campaign.
The term 'angry' defines these people. They have no respect for the democratic process.
There was no outrage by the yes side when the AFL took the yes sign down, but we saw countless levels of anger from the no side when the sign went up. This is quite a ridiculous notion to suggest the yes side were behind the threats.