The Shuttle Program was first and foremost an attempt by NASA to save money, by re-using the launch rockets and the shuttles. The thought of launching hundreds of military and civilian satellites from shuttles obsessed the accountants at NASA, to the detriment of space science. In hindsight, the Space Shuttles were an accident waiting to happen. We now know that there are more efficient, economic and most importantly, safer ways to do things in space. After all, the most important payload is the astronauts.My questionable opinion is that the Shuttle Program has damaged a lot space exploration, simply because it blocked resources for a program without future. Just Musk has demonstrated that also rockets can take land after a mission. There was no need for a Shuttle, after all.