I have used hazzards when traveling at unsafely slow speeds with very bad visability. I have FOLLOWED police cars who were using their flashing lights for the same purpose. Being unseen is the absolutely MOST unsafe habit. I have ranted like you but from people who don't even BOTHER turning on headlights in low visibility situations of heavy fog and prefer to just depend on DRL to do the job. I find it MOSTLY happening from owners of vehicles that have DRL systems as many of them don't work properly and light only one light or none at all and NEVER do they show any lights from behind so THOSE are the unsafe individuals. I'd MUCH prefer to be in charge of making SURE my lights work when visibility is low and I want them showing from both front AND REAR.