Frankly, high quality red dot sites are built tough. Same with any high end optics...
However, just like anything else mechanical, it can break.
However with the high end stuff, the breaking is pretty rare.
If your life depends on it and you're out in the sandbox, yes I'd get some kind of BUIS... if you're a plinker here in the safety of our great nation, i think you'll be ok without em.