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how could apartheid have been prevented.
There letting water out of the Mississippi because so then it wont flood as much as it has been.
The Mexican oil spill could have been prevented. All oil spills could have been prevented if it weren't for careless people! An automatic switch should have been installed on the inside of the pipe.
This is an unanswerable question. There is no way to count "deaths that could have been prevented," let alone deaths that could have been prevented by an indirect correlate.
No
Yes, it is very likely that the planes crashing into the Twin Towers and the Pentagon could have been prevented.
The fire at the Triangle Shirtwaist Factory could certainly have been prevented with the knowledge and procedures we use today. Its death toll could have been reduced if the doors had not been locked and the switchboard on the 9th floor had been in operation. Whether the fire could have been completely prevented with the technology and procedures of the day is an open question that can never be completely answered.
the rivers don't flood, but the Louisiana wetlands are lost from the levees.
If communist North Vietnam did not try to conquer South Vietnam, the war would have been prevented.
maybe
Yes.
It couldn't. Cyclones are a natural weather phenomenon which cannot be prevented or controlled.