That doesn't show credibility for defense. It shows that holes made by fast moving pieces of copper jacketed lead can cause someone to bleed out and "not make it." I know, shot placement is key. But if you tell me you can hit the brainstem at 7-10 yards under duress in a constantly changing and moving environment, I'll call you a liar (I know you wouldn't say that, you're not a liar
). Good JHP ammo, will stop an attacker with fewer shots, or so the statistics show. This is why LE does not issue FMJ anymore (well one of the reasons, anyway).
Right now it's tough, and if you truly cannot find a good premium round for defense, then whatever you have is better than nothing. But at least try to get good ammo. It's safer for you and it's safer for the innocents who might be in the area.