My guess is because when you make it so stupidly obvious it's unbelievable, people will respond exactly like you have, ask exactly your questions, and end up convinced it's not true. Ad hominem doesn't help (as much as I may agree!).

The fact remains that these people the guy found look extremely similar, but correctly aged and have the same names. If it's not indicative of some bizarre conspiracy, it's still extremely weird a coincidence.

I'd have hoped someone could calculate some odds based on names and looks or something and make it make sense.