There's no good reason for them to be on the road. Consider the following:

• They're extremely loud and cause noise pollution

• They're very dangerous on the road and have high accident rates

• They're bad for the environment and cause air pollution

• They're extremely inefficient as they can only carry 1-2 people max

• They can't carry cargo

• They're dangerous for pedestrians

• They're very demanding to operate

• They're virtually useless in the winter when there's snow, ice, and hail

• The people who tend to drive them tend to be assholes who don't respect road laws

People complain about cars all the time, and while our car dependency is definitely a big issue that we need to address, cars still have a lot utility. Motorcycles on the other hand? Not really. I think getting rid of them once and for all is good way to immediately make our roads safer, simplify traffic, and open up a pathway to move away from cars.