I do actually think the design of bounce houses themselves is indeed what makes them dangerous. They are lightweight and filled with air by design, to be portable. They then can catch wind underneath them, again due to their design and how they are used with kids jumping on them, which makes them airborne. It is THIS specific situation that I take issue with and think they should be banned. Normal injuries from kids jumping into each other are acceptable imo, not a big deal. Even kids falling from a set height with most traditional playground equipment is acceptable risk as long as the structure itself is firmly in the ground as it is designed to be.
However, the design itself of bounce houses is the problem. They very thing that makes them bounce houses, is what makes them unacceptably dangerous imo.