I dunno, it seems every other internet hipster sciency afficionado is all about tesla this tesla that, in this demografic he seems very popular. yeah the general public doesn't know about him, but how many really understand the implications of works by the likes of Einstein, Newton, Heisenberg, and so on? I had no clue about all of this until I actively started to learn about it. of course, back when I was completely "scientifically ignorant", I heard about these people, but I had no understanding whatsoever. it's more important imo that people understand science more than to know which scientists are famous for something they did. that's why I think that Carl Sagan's approach to popularize science was fantastic.
Man don't even bring hipsters into this. He is a hero because the public love an underdog. Anyone can resonate with his story, triumph, and defeat at the hands of business interests. Someone with the level of passion, dedication and moral vision than he had is someone you can't not love.
I disagree with the rest of your post though. There's understanding science, and there's understanding science. I understand science, I loved it, did well in it at school, still dig around from time to time. But I don't understand it in terms of being able to do the higher math, it's a whole new language. I assume, correct me if I'm wrong, but you are of a similar position to this? I think most people are. But if you don't understand it completely then really it's more about faith and trust that you know it's true, because you can't prove it yourself at this point. I just happen to not trust the overall thrust of conclusions that modern science entertains.. and that is a perfectly valid position to hold, because no one knows what the score really is.
Newton I can dig since he actually experimented, though when it comes to the nature of colour I prefer Goethes prism experiments than Newtons.. Goethe had the natural science streak in him which I resonate with.
Start at 40:00 for Goethes prism experiment.