It's just another one of those underrated forms of media that people enjoy. Generally speaking, 'nerds' are just people that seek out things to suit their tastes that often go against the popular norm; you could ask the same question about Star Trek or Warhammer or anything really. It wouldn't say it's inexplicable it's just everyone has different opinions - people like anime for different reasons.
It's actually a really good question, it's just the wording that bugs me. I really hate this stereotypical 'nerd' image that people have so I can't help but wonder what kinds of people you're imagining when you use this term. Like many casual fans of anime I fit into society just fine and don't try and single myself out just becuase of one hobby - and It doesn't change a thing to anyone I tell in passing.
It's actually a really good question, it's just the wording that bugs me. I really hate this stereotypical 'nerd' image that people have so I can't help but wonder what kinds of people you're imagining when you use this term. Like many casual fans of anime I fit into society just fine and don't try and single myself out just becuase of one hobby - and It doesn't change a thing to anyone I tell in passing.