If the disasters happen repeatedly despite safety and environmental concerns being the top priority, then clearly they are not.
Money comes first, safety second.
Obviously there will be a lot of effort spent on safety, because otherwise there would be even more accidents, and the whole company might be forced to shut down.
As it is, they have just found an equilibrium of safety and greed.
Businesses exist to make money. There is a constant demand for oil in the market; the world as we know it needs some level of oil to continue to function. If you can't ban the extraction oil, and you believe in the continued existence of private business, then profit and safety have to co-exist as priorities.
All industrial operations are inherently exercises in risk management. I think it's smug to phrase that as an "equilibrium of safety and greed" but frankly, yes, in order for things with risk to happen, you have to accept a level of risk, which will never ever be 0.
I work in another industry (not oil & gas) where safety is a consideration in every action we take, and it's not just lip-service. It's a down-to-our-bones mentality that we won't do anything unsafe, or allow anything unsafe to happen. Accidents still happen, and it's not because if avarice.
In many countries oil is taxed at over 70%. If oil prices grew by let's say 50% - these countries can lower the tax and consumers wouldn't even notice.
There's no excuse for ignoring external costs - these costs are real and paid by everybody while profits are gathered by only a few people.
It's deeply unethical but more importantly irrational - people profiting from the fossil fuels have no incentives to fix anything if they aren't forced to deal with the external costs.
Currently the system is - they get the profits and everybody pays for external costs. That makes alternatives to fossil fuels less attractive because you will pay "petrol tax" anyway in taxes spent on all the external costs, even if you don't buy any fossil fuels ever.
Money comes first, safety second.
Obviously there will be a lot of effort spent on safety, because otherwise there would be even more accidents, and the whole company might be forced to shut down.
As it is, they have just found an equilibrium of safety and greed.