Unfortunately, many times people who do great things turn out to be awful people, or have some really problematic views. Henry Ford revolutionized automobile manufacturing with the assembly line, for instance, but was also infamous for being horribly racist and anti-Semitic. Thomas Edison invented or helped facilitate the invention of many things (useful lightbulb with carbon filament, movie projector, etc.), but was generally known as having a lousy personality and suing everyone for IP stuff, resulting in the movie industry moving to California to get away from him.

Can you imagine what things would have been like in Ford's time if he had the internet and Twitter to spread his views?