[Medox]

I get the Mars part but they could have the walls to be fail safe at least on Earth. It's not like they will improve the design only if the rocket falls over and explodes. They would still have to land it up straight, while having some sort of "no wall touched" target (or award). Not to mention the money they save if not every fail is also a complete loss of the rocket. p.s. Money left is also good for future Mars missions.