I think some of you are being a bit unfair on the police here.
The laws regarding dual carriageways were put in place long before the volume of traffic rose to it's current level. Like them or not, the speeding cars and trucks are now present and the police have to deal with it. The reality of it, not your idealistic wishful thinking.
Should cyclists be allowed to cycle on the motorway? Because that's effectively what many of these dual carriageways are. And if the only road that went between where you were and where you wanted to be was a motorway would that justify cycling on it?
And again I see that everyone is making huge assumption. We don't know what the police said or did, who was at fault, how well lit he was on a pitch black night...
Yes, it's sad. Maybe the police are biased but the truth is that it might also have been the guy's own fault. The fact that it is sad is the only thing we actually know for sure.