This Video shows us a motorcycle that rides at a very moderat pace.
Some people may claim that the rider does not have much riding skills. While that might be true, I find it silly to assume that every rider at any time rides to the limits of his/hers ability.
But the video also displays the bicycle riders total disregard for the rules of behaviour in traffic. He's all over the road, and passing the bike on the inside in a RH turn. I will not say that the MC rider chose the perfect line in that turn, but if he had chosen to do so, there would have been an accident.
I have not ridden a quality racing bicycle, but given the law of physics, it's low weight compared to a MC dictates it's potential to maintain a higher speed in curves. But once the curve is complete, a heavier MC will be able to keep higher speed when the curve is not limiting factor, and the MC superior brakes will be able to keep the speed up closer to the next curve.
All in all, these bicycles that plays with other traffic down hill scares me. A loaded GSA with alucases would knock a bicycle off the road without even noticing it. So when a bicycle drives 'all over the road', its behaviour is highly unpredictable for any other traffic, playing with vehicles that will flip the bicycle over easily.
To me, these bicycle riders are not brave or skilled. They are just good old-fashioned stupid.
I'm afraid I agree with most of what you said. My experience, sadly, is that cyclists are often the most agressive and grumpy road users tou're likely to meet. Well they'll be really grumpy when a motorcycle or car driver knocks them off as they undertake at speed. See it all the time. It is truly stupid.
I watched a Youtube recently where two cyclists get knocked off in Paris as they speed past a car on a city street. The driver unexpectedly turns right, they couldn't stop because they a). Were going too fast and b). They failed to see the possible danger. The car driver? He was fine no doubt, but he simply made a mistake in not seeing them. Thats the point for me. When we ride our bikes we have to do it in a way that accepts drivers might not see us. No use complaining about a driver when we're in hospital, or worse, if we could've anticipated a possible danger and helped to avoid it. What possible comfort does it give to a grieving relative when a driver gets prosecuted for due care and attention, rather than getting to work or finishing your Strava route 2 minutes slower?
So if cyclists continue to ride aggressively, overtaking cars or undertaking campers, lorries, whatever, that might be a good story down the pub with your riding mates but when the holes in the Swiss cheese line up one day, get ready to fall through

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I guess that is why a lot of road racers pick up bicycling...For me I must say it is probably a good sport for health reasons but without a motor too slow and boring compared to motorcycling...Downhill Mountain biking is probably just as exiting but much more dangerous as in injury prone...