Vodun, if it can penetrate an attacker, it can penetrate walls. I'm also not sure how you feel hollowpoints have a greater risk of overpenetration than FMJ. If they fail to expand they're equal. Through an attacker the issue will be less.
I understand the sentiment to use FMJ only. Terminal ballistics are more predictable and in some guns ammo is more reliable. While I dont think that the terminal ballistics is the only measure of effectiveness, I would not say JHP are the cause for failure-to-stop. You're talking about a diameter increase of usually around 70% and a surface area increase of about triple by going JHP instead of FMJ. I would say that provides a significant benefit.
The big reasons to go FMJ are to avoid underpenetration and reliability. I've never heard JHP demonized for being more likely to overpentrate or less like to stop a BG, unless you lose a significant amount of penetration (i.e. with small calibers at low velocities).