rapeseed is not healthy

in my opinion 

rapeseed oil is not healthy because it contains too little saturated fat 

but rapeseed oil is common in cooking food and deep frying chips 

because rapeseed oil is cheap 

olive oil or butter is much healthier but is more expensive 

chips deep fried in olive oil are expensive 

quality restaurants sometimes use olive oil 

but fast food restaurants probably use rapeseed oil 

and other cheap oils