Which ones? The ones that do are almost all prototypes (for instance SpaceX Starship) that have new technology innovations. Unless they are manned the safest th

Which ones? The ones that do are almost all prototypes (for instance SpaceX Starship) that have new technology innovations. Unless they are manned the safest thing to do if they are operating outside limits is to use the FTS (flight termination system) to make a large fast object into much smaller pieces. Unlikely most other vehicles, rockets can't just coast or glide to a stop if they go wrong.