It is highly unlikely. Once the man on the street entered the fray, change was bound to happen.
how could apartheid have been prevented.
No they did not. The French Zouaves were first created as a unit in Algeria in 1831. Since the French Revolution ended with Napoleon's coup in 1899 such an engagement could not have been fought.
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.
Yes.
maybe
It couldn't. Cyclones are a natural weather phenomenon which cannot be prevented or controlled.
I disagree with the premise of your question. It stipulates that the French Revolution had a single leader aside from rage resulting from opression and mass chaos and that had Gandhi been able to take control it would have been a revolution. But, in an attempt to answer, it would not have been very different. Had Gandhi been in control and tried to solve the problems peacefully, he could not have maintained power over a group out for blood.
As far as I'm aware, The French Revolution was started by the French, not by George Washington, who was and had been the only US President at the time of the French Revolution. Unless the Americans have built a time machine.