As I recall, the last time we went to the Moon, it wasn't very economical and the risk was somewhat higher than zero.
Yep we had the technology that would work within the constraints.
We no longer have the technology to overcome the constraints imposed by the environmentalists.
The last Shuttle blew up because the foam used to insulate some tanks was not the best material for the job. Why was the best material not used?
Environmental constraints.
You keep saying "can't." This is called a self-fullfilling prophesy. Stop that! If you try, you may well fail. If you do not try, you guarantee failure! Stop it!!! None of the knowledge we had then is lost, and we've added much to it. In 1960, 43 years ago, we did not yet know if men could survive in space, in low gravity, under the kind of acceleration needed to leave the earth. Now we know. There are other things we still don't know, but failure to try is the only guarantee of failure.
http://www.prometheus-music.com/space.html listen to the mp3 of #3, Fire in the Sky.
Then listen to the mp3 of #16, Legends.
Quit whining, and make a choice. Failure to make a choice IS a choice.
Do you know what you get when you teach a baby not to try?