S'ppose I ought to answer your question too Mosis. Then maybe you'll answer some of mine eh?!
The truth is, like most other people on here, I don't "feel the need" to break speed limits. Sometimes I do and sometimes I don't - it really depends on what's appropriate and safe at the time. I happen to run a big, diesel people-carrier as my main transport so I can assure you that I don't go out to break the speed limit just so as to enjoy the heady adrenalin rush that such a rewarding "driver's car" brings!

(That was sarcasm by the way!) The truth is, it's not very fast -but perfectly capable of exceeding all the speed limits on UK roads - just not by as much as some cars!
I live in a rural area where most of the roads are NSL. Many are single track. Some are safe enough at 100MPH in places, others are lethal at 40. They all have a 60 limit if you're a passenger car though. Seriously, if there's one thing that makes you realise how daft it is trying to impose a one-size-fits-all speed limit, it's rural roads. Every mile of every road ought to have a different limit! (and it would change with weather, traffic and so on). Sometimes, my job takes me to places 100 or more miles away. Most of this gets done on motorways. The main limit on the speed at which I would naturally choose to drive is obviously safety but there are other factors too - the cost being the next biggest. Obviously, at higher speeds, something with a big frontal area can get a bit thirsty! Besides, believe it or not, I do have a bit of an environmental conscience!
You seem to have decided that the only reason people could ever possibly want to speed is so that they can kill, maim, terrorise and oppress the innocent. Maybe there's the testosterone factor too. I don't know. I'd be curious to know why YOU think they speed though.
The only only thing I WOULD say on that point is that I'm clearly not the only homicidal maniac out there. In fact, I'm in a majority! If you do any reasonable number of miles on our motorways, you must have noticed that most cars travel between an indicated 75 and 85 most of the time (as do I). The irony of this can't be lost on you! I wouldn't mind betting that many of them would be in support of cameras and would deplore speeding! My father in law used to wag the finger at me somewhat (until he got one!) Oh how we laughed!
So the "bottom line" is that I (sometimes) speed for any of the following reasons:
1. It saves me a bit of time.
2. It leaves me free to concentrate on the road rather than the speedo (we're not all superhuman, you see and some of us need to look at it periodically - unless we're going to stay a LONG way below the posted limit)!
2. It builds me up a "buffer" against unforseen circumstances, tailbacks, getting lost, weather, whatever. if I can go a bit faster on the stretches where it is safe to do so, I am under less presure to try and "keep to time" in the places where it is not. That's when it gets dangerous. And believe me, if you've never been in the situation where unforseen circumstances have left you running a bit late, you're a very luck man and I'd like to know if there are any jobs going at your place of work!
3. It's what everyone else does. That doesn't mean I'm a sheep, it means I'm considerate enough not to want to place other road users in the position of getting stuck behind me and having to overtake. Remember I spend a lot of time on single carriageway "A" roads too and the last thing I want is an inexperienced driver (for whatever reason -impatience, testosterone etc) getting killed or injured (not to mention whatever's coming the other way) as a result of my unwillingness to move with the traffic flow. You might be able to find sufficient consolation in the fact that at least YOU were well within the posted limit - I doubt I'd find it so easy to shrug it off.
Does any of that answer your question?