Well, in my opinion, the LCP and the LC9 are both light weight handguns, designed with the purpose of making them carry-friendly.
I think it would be foolish in the extreme to think that these guns are capable of lasting long when +P ammo, or +P+ ammo was used. Doing such will certainly shorten the life span of the gun.
That is not what they were designed for. They are not the rugged handguns that Ruger, here-to-fore, has been noted for. Actually, if old Bill were still alive, they probably wouldn't even be in the line.
The blow up that we are talking about would likely have destroyed any other .380 being marketed today, even the all steel guns.
In short, it was not the gun that caused the failure, it was the ammo.....IMO. 8)