In each case, I doubt that it really is hard to figure out who they are.
Maybe it is the way the press and social media work. You get as many clicks for a wild theory as you get for a properly researched opinion.
As for Satoshi Nakamoto: The most obvious candidate seems to be Adam Back. His invention of proof of work, his biography, character, writing style and role as the CEO of the company behind the main wallet software all point to him. Also, his current communication "Bitcoin looks like something that was discovered rather than invented". That's something a creator typically says about a particularly great piece of work they did. Are there any arguments why he might not be the inventor of Bitcoin?