It can exist, but shooting through a barrier is probably not the most likely self-defense scenario (did you say you were LEO with a different need?). An idiot chasing you down with a car, yes...so if you have reason to think that would happen then OK. What I am saying is that if someone is behind a barrier there maybe a decent chance that you can escape/avoid the situation...maybe not, but if you can escape and don't attempt to you might find yourself in quite the legal tangle (assuming you are not law enforcement).
At home I don't want to shoot through walls...because I don't want to hit one of my children. I go with flextip ammo that will break apart....it also has more of an immediate energy dumping shock to aid in stopping the threat. I had an AR for inside home defense before it was cool.
Unless you have something else in mind, a more specific need, most shootings are face to face and very close. Therefore, the greatest likelihood is no barrier. I've had the need for my weapon (or didn't have one and wanted one because there was a very big one pointed at me) about a half-dozen times....no barrier was present in any of those situations.
For myself, I ponder these two things:
First, it's your deal, but before using a fmj round to shoot through a barrier you might want to consider the legalities and decide to safely exit the conflict if you and anyone in your legal protection (immediate family member, etc.) can leave safely. If it's not safe, don't leave.
Second consider what you had in mind for a barrier. If you are at home a JHP will fly right through sheetrock...consider the difference between cover and concealment. A "barrier" might be either...what did you have in mind? If the bad guy is using concealment the JHP should do quite well.
For carry I use CorBon DPX, Hornady Critical Defense or Federal EFMJ (works really well in 45 ACP, expands to .75" flower petal). If you are LE or you are concerned about body armor this may not be the best plan. For me, I'll stick with the above and I will shoot until the threat stops and if I am concerned about body armor will aim below the belly button which, my friends back from the sand box tell me, works quite well.