Even if we want to fight them, how we going to get our money back. ICO is not legal and there is no easy legal way we can bring them to book. Even most ICOs won't vanish after ICO, they will prefer maintaining the community without developing their roadmap as it is expected of them.
Because there is no regulation about ICOs and the token we bought is not an investment instrument. I think police can not arrest people who involve in scam ICOs because there is no government regulation