My take for what it's worth:
My carry ammo MUST penetrate sufficiently to reach the vitals of my assailant and be effective.
The danger of the more likely 45-85+ percent (depending on whose stats you use) misses are an issue that must be given consideration and addressed to reduce the likely hood of unintended injuries. (this is not a criticism of the membership here, I don't think the members of this forum or some of the other more responsible forums feel otherwise, in fact we are doing our best to address this in ourselves and our students)
BUT it is also dangerous liability wise to minimize the danger of over penetration based on our statistical likely hood of missing the intended target, especially on a public forum. I'm pretty sure this logic will not fly with John Q jury person and they will not look kindly at such comments. They expect us to hit what we're shooting at. Lets face it, if we hit an unintended target we're paying for it. The amount paid can & will be based on our actions and comments leading up to, during and after the shooting.
I want a round that if I do my part it will do it's part with a minimal possibility of passing thru the assailant with enough energy to endanger innocents.