Here's an explanation for ya. Lurk moar. Every single point you brought up has been posted, reposted, debated and debunked. There is a search function on this forum, and it is very easy to use.
It took a genius to design Leonardo da Vinci's helicopter prototype, but it only took an idiot to take a look at it and go "are you nuts? people don't fly, and that thing certainly won't help."
Is Dino open source?