Dems in Denver had adequate police protection. There were a dozen rioiters and FOX made it their leading news story nonstop.
Repubs in St Paul didn't have enough police. many of those arrested admitted they saw opportunity with no police presence to do a little looting.
Or, you can guess a few riotous acts were desirable for FOX news reporting. When you don't have enough police, and you have thousands gathering, people see opportunity to steal things. In Denver, they had half the police in the state for Obama's crowd of 80,000+. Makes you wonder if the repubs actually understaffed police just to be able to bitch about protesters...