A high-hooded truck or SUV is far more dangerous to the public than a small car, and a small car is more dangerous than a motorcycle, so a speeding ticket/liscense points/jail time for an SUV should be >4x more severe than a motorcycle doing the same violation, and bicycles should basically only recieve token fines.
In what way?
The point of impact is higher. Low points of impact break your legs and let you roll over the hood, while high points of impact break your spine.
Visibility is also limited in those kinds of vehicles.
I can see a small child in front of or behind my hatchback by looking out the windows, and its even easier with the backup camera.
A 5’-0" (152cm) person (who may be fully grown) was basically impossible to see over my old truck’s tailgate.
Visibility, mainly. Mass also, of course, in that it’s an important part of kinetic energy. Also the IQ trends of the (jacked-up dodge ram super-crew-cab long-box Extreme trim-package) driver.