I respectfully disagree. Driving on the motorway, I regularly see motorcyclists weaving in between lanes of traffic at up to and beyond 100mph, forcing their way through the traffic making drivers slam their brakes on, and overtaking on blind bends. This is not a case of skewed perspective - it's a case of observing what people are actually doing. Perhaps people don't ride like that where you live. If so, you're lucky.
I don't know anything about motorbikes, but I'm assuming a sport bike would be something like this, as opposed to the armchair-on-wheels type cruiser. If so, you very, very rarely see the latter here in England, with the vast majority of motorcyclists riding the former, sporty type. Clearly, they choose this type of vehicle because it is very, very fast - and they use that speed with no respect for other motorists.
I certainly don't mean to imply that car users (I'm assuming that's a 'cager') all drive perfectly - far from it. All I'm saying is that I see a much larger proportion of motorcyclists driving recklessly that I do car drivers.
I don't mean to hijack your thread with negativity, I'm just offering a different perspective. I'll go away now 
Don't go away, it's a valid conversation, and kind of important actually.
I don't know where you're from, but here in the states, yes, a majority of bikes are sports bikes (the one you linked is a good example of what we call a "crotch rocket"). The other notable purchases are Cruisers (Harley Davidson and others) -- what you call wheelchair bikes, followed by touring bikes which are usually the larger bikes with the bags.
Each bike, like it's owner, has a personality of its own, and tends to amplify those tendencies in their respective owner.
Sport bikes are owned (primarily) by younger people who still feel that they're invulnerable and immortal. As such, putting 150 hp at their disposal in a 400 pound package capable of 200mph has never been a good idea, but until the authorities REQUIRE people to have certain levels of training for each type bike, there ya go.
The problems you see are more a problem of regulation, training, and lack of police action. If the police cared enough to crack down (as they do here in my area of the States), then you'd see a lot less of that type crap.
Cruisers (generalizing) are owned by older, middle aged people who just want to enjoy getting from place to place with a bit of style. They don't particularly do 300 - 400 mile days, but they might, on occasion, get on the bike and go bar hopping.
Touring Bikes (again, generalizing) tend to be owned by middle aged or older riders who enjoy being able to -- on a whim -- pack up a suitcase, then ride in any given direction, usually long distance, with or without their significant other. Think of them as the Winnebego of bikes.
I fall into the latter category, though I use my bike for everything (weather permitting). I love being able to get off of work on a Thursday for a three day weekend (as I'm doing today), having 3 days clothes in the bike, and heading off on a "loop" which encompasses 4 states, and about 1000 miles, on a whim.
The only uncertainty being the hotel room for the night's stay, but even if everything's sold out, I have my tent packed as well. All this while getting 42 miles per gallon, and rocking out to my iPod.
