People who might have had an impact on the world if they had lived

Jehan Alain a French composer who tragically died, age 29, 1940, after single-handedly killing 16 Germans in WWII, the German's recognized his body and buried him with full military honours out of respect for his Musical work.

His work was considered amongst the most original music of the time and he would undoubtedly, in my mind, been one of the most prolific and revered composers if only he had lived.
 
Crown Prince Rudolf of Austria (d. 1889 at Mayerlink), heir to the Emperor Franz Joseph. He was liberal minded and wrote reform-oriented articles for the press under a pseudonym. Was friendly with the Jews and had scientific interests. Hated Kaiser Wilhelm II and once expressed a wish that Wilhelm (I think this was before Wilhelm assumed the throne) should die in a hunting accident.
 
John Reed, author of Ten Days That Shook the World and a founder of the American Communist Party. It would have been interesting to see him get expelled from the party and denounce communism several years later.
 
There are two very early-in-life deaths that could be added to the list:

Patrick Bouvier Kennedy - If JFK's 3rd child had survived, who knows what he could have gone on to do? There's the possible sibling rivalry with JFK Jr. for a kick-off

Jesse Garon Presley - Goodness knows what would have happened if Elvis's identical twin had survived..
 
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