there has never been a rocket system that hasn't had a catastrophic failure at one time or another
For unmanned rockets, occasional catastrophic failure should probably be designed in at some level.
The penalty of any added weight for something going all the way to orbit is very high (in terms of reduced payload). Henry Ford once asked which parts on his cars never went wrong, and then ordered "make them cheaper". For getting an unmanned vehicle into orbit, there's far more justification for "make them lighter".
This is also the weak point of any proposed spaceplane. Because it'll cost very much more than a rocket, it has to be reusable many times, but that level of reliability will impose a weight penalty. It would be a non-starter, if it didn't have the advantage over a rocket of being able to do away with a large weight of oxidizer (it can use ambient air until it's a few miles up).