Of course CASA bureaucrats do put cost in front of safety when it comes to the powerful airlines.
For example CASA allows twin engined wide bodies when they have a greater chance of being downed by a bird strike compared to a four engined aircraft.
Why do they allow this? For one reason alone- affordability! It results in slightly lower airfares and higher profits ( or less losses) for the airline industry.
There is no other reason. Pity they can’t use the same commonsense with GA.