I'm not suggesting that it's always dangerous, just that people shouldn't be so surprised when they get tickets for it (or think they're going to get tickets for it). Everybody knows that there are cameras around, and if you're going to break the speed limit then it's a risk you run.
And, sometimes, it is also dangerous. I know it's not representative of all roads, but there have been a fair few accidents around on the road where I live because people regularly ignore the speed limit and realise too late that it's so low because there's a set of hazards around the blind bend.