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 is very lifelike from that angle, but I think the uncanny valley would set in a bit more in real life. Also, the skin is a bit off. It looks like it's either synthetic, or the "person" is very ill.
You have been ignored for common interest of mankind.
Why do we fall back to earth? Because our weight pushes us down, no laws, no gravity pulling us. It is the law of intelligence.
Nomad is a superhero.