You can't - the best you can do is reduce it.
how could apartheid have been prevented.
How could you tell if the a Historical source is tainted with bias of a specitic agenda?
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.
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.
Science should not be bias, it either is or it isn't. If one is basing their study on a bias, they could miss or dismiss certain results because of their beliefs rather than facts. It would be faulty science.
no
yes he could
Buchanan could have prevented war by not allowing the Confederate to separate from the Union. Buchanan could have also acted differently on issues of slavery, especially in Kansas.
They could have prevented WW2 by giving in to the Nazis. -That was not acceptable to the British people.
It couldn't. Cyclones are a natural weather phenomenon which cannot be prevented or controlled.
The Rodney King case could have been prevented by establishing clear guidelines and training for law enforcement officers on the appropriate use of force, implementing better oversight and accountability measures for police behavior, and addressing systemic issues such as racial bias within the criminal justice system. Additionally, early intervention in cases of officer misconduct and a commitment to community policing could have helped prevent the escalation of tensions that led to the Rodney King incident.
if you really wanted to