When you are in a harbor and you see a boat departing, keep looking at it. In fact, take the world's most accurate telescope, and, after it has disappeared over the horizon, see if you will be able to see it. You won't because the Earth's curvature has caused the boat to "disappear."
Next, what about the people who died aboard Challenger and Columbia? I really, honestly, do not believe they would be killed...what exactly would NASA have to gain by killing them?
Lastly, go to a space shuttle launch. I've been to one, and have seen the space shuttle keep going...and going...and going...until it's out of sight, probably in orbit. If the shuttle did not reach orbit, it would fall uncontrollably to the Earth and burn up on reentry. And, from the little I am aware about space shuttles, I know that they land and most of the time the people who were in them come back out alive. How do you explain that?