Not at all the pelvic girdle is a legitimate target area in all of the arts quoted, only the groin is disallowed. In MT the teep and long knee are often aimed at the pelvic region but not in any wistful notion of breaking bones simply in an attempt to target the bladder regionIt is something that has to be targeted. In any of the full contact bouts you mentioned, you would be immediately disqualified if you tried that.
But surely if it is so fragile there would be at least the odd accidental fracture.And in most athletic sports you would not see that happen because there would be absolutely no reason to do it.
yeah and a mastery of tai chi will allow me to hurl balls of chi energy across the room and knock people out without touching them. LolClimbing and car accidents do account for a lot of these type of injury, but if you are aware of how a body's frame is put together you can target certain places where shock or impact can seperate certain parts of the structure. A mastery of Jiujitsu will give you all that
Targetting weak spots in the human anatomy is not solely the preserve of jiujitsu, it is common place across most martial arts (including Wing Chun). However those with a practical bias have tended to move away from targetting areas which require the ability to split a gnats c*ck with full power
Sorry if this post seems a little dismissive or sarcastic but this is one of my pet hates in martial arts. Ultimately to each his own, and where you choose to kick is obviously entirely your perogative. I prefer the achilles tendon, shin, knee, thigh, groin, spine etc as high percentage targets but its only personal choice