There's an error that people make when discussing the Fermi paradox, where they explain how one civilization might collapse and then move to claiming that that's why there's nobody out there. But to explain the Fermi paradox, you must explain why <i>all</i> civilizations collapse before colonizing the galaxy. It's one thing to make a fashionably self-loathing claim about how easy it is to screw up your environment... but is <i>every</i> alien race going to make that error? Even in their different environments? Probably not, no.<p>Similarly, in this case, the question is not "Why doesn't a particular time traveler never visit us?" The question is, why don't <i>any</i> time travelers ever (seem to) visit us? Yes, it may be the case that we aren't anywhere near as interesting as we think. On the other hand, in all the future billions of years, which may very well include the evolution of a new intelligent life form on a <i>currently lifeless planet</i> that will come to find Earth and be interested in its past, <i>none</i> of them <i>ever</i> show any interest in our era? Not even one particularly weird pure-human fetishist subculture which attracts hardly more than one out of a quintillion sentient beings but results over time in a subculture that actually dwarfs our entire population right now, all of them with access to our time?<p>Yeah, it's probably just that time travel as conceptualized in this question is simply impossible.