Cyclist Killed

Truck drivers .
Bus drivers .
Taxi / Cab drivers .
Car drivers .
Motorcyclists .
Cyclists .

Q1 … Which one of the above is / are legally entitled to venture onto the open road without any training and or protection of any kind ?

If your answer is the same as mine then how can everyone else be expected to adjust the way they work to fit them in ?

Cyclists baffle me , why would any person insist on putting themselves in a position where they could quite easily get hurt and claim its their right to do so and its everyone elses fault ?