I got punched in the throat a few weeks ago sparring with a guy who just won a lightweight mma title. He doesn't hit like a bitch (actually I've met a few bitches who hit pretty hard but you get the point) and last time I checked, I'm not dead.
Also just got over a bruised trachea from BJJ. That was fun too......
Still not dead.
And if every time you slammed somebody in the ribs there was a high risk of internal bleeding you'd have piles of dead fighters all over the place.
There's no magic bullet for fighting. You hit (or whatever) the other guy until he stops moving and hope you can keep him from doing the same. Course I suck, so maybe somebody wants to offer a different opinion.