everlong I have been stuck behind people who have hit the brakes for literally every slight deviation from the absolutely straight. I have no trouble with people slowing down on bends where it is sensible to do so - i.e. if the bend is a tight one, has a hazard behind it, has reduced visibility. Your roads may well be like that. Lots of roads and their bends, however, are not. So you can't make a blanket assumption that slowing down on any bend is always necessary, not can you assume that not slowing down is always sensible. See what I have said above about adapting.
If you do not adapt your driving to the roads and the circumstances, then you should not drive. Round my way there are some roads that I slow down for, and there are some that I do not slow down for. When it is wet, dark, icy, foggy etc. I always slow down to an appropriate degree. Driving according to dogmatic ideas is just plain dangerous.
We get the same people round here that other people have described above - the ones who will do 40mph no matter what the speed limit or the road conditions. I call them the '40 is a safe speed' brigade. They do 40 through the villages, past schools, in the pouring rain, on snow. They are very very dangerous drivers.