Arguing about the idiot rates in cycling compared to cares is a bit silly. In my experience there are idiots in everything and the ratios are about the same wether it is cycling, driving or flying and thankfully those that are idiots are the minority (albeit the most visible for obvious reasons) and to tar a whole sport or group with the one brush is simpleminded.
I always used to think cyclists were stupid and had no right to the road but last year I bought a bike to get fit (yeah yeah I know doesn't look like it worked) and road on our quiet roads every evening for about 5 or 6 months, and it opened my eyes to a lot of things. I road in daylight as well as after dark and the roads around home are in the country and fairly quiet with a couple of feet of tar outside the fog line, I always tried to stay outside the fog line and always had bright flashing rear red lights (even in daylight) and the different car reactions were eye opening. The majority would pull into the other lane or partly move over and give me plenty of room (extremely rare to have a car from both directions and if I did I always pulled off, yeah I'm a chicken) but there were a few who seemed to come closer and a few that just held their line and didn't pay me a thought.
Towards the end of that time I felt a LOT More comfortable riding at night as you could tell when a car was coming from behind and I'd just get off the road, it took longer but felt an awful lot safer. I road into town a few times and enjoyed it but I dred the thought of riding in a city and take my hat off to those that do.
So basically I know there are some idiot cyclists but spare a thought for the majority and try to give them all a bit of room and remember they all have no doubt had to put up with some idiot car/truck drivers in their time. They do have just as much right to be there, most would own cars too and pay just as much tax as the rest of 'us'. And maybe have a try of it yourself as has been said it is good exercise and it will open your eyes to e other idiot road users out there.