It all boils down to the same thing.
Car drivers want cyclists to have the same restrictions as they do. They see it as being fair.
They cannit understand that cyclists don't because they don't kill, injure or cause damage to the same scale. It's why buying a screw driver has less restrictions than buying a rocket launcher. The owners of rocket launchers will complain that a screw driver can kill.
Often more...
We have a petrol lhead at work who is always on about this, despite all the cyclists showing they have insurance!
Then there is "Road Tax" where he feels that £50 is a fair amount, but when asked if that is for all Class A vehicles he suddenly feels that cars don't need to pay "Road Tax" if they have low emissions.