7.62 everytime agree totally your last paragraph. The stopping power of a high speed train, leaving you in no doubt, that if you took the shot, the person at the other end wasn't going to be a threat to you again, regardless of where he was hit. Surely that is what warfare is all about..........ensuring you inflict more casualties on your assailants than you take yourself, and winning the firefight at all costs.
The issue with the 5.56 was, it was great in CQB Jungle Warfare type scenarios, because it was light and could chuck something into the foliage quickly, but beyond that, and certainly as proved in Afghanistan and Iraq it took more rounds to the do the same job, as one solitary 7.62mm would.
Politicians and Scientists through cuts in finance and practicial reasoning, arrogance and sheer doggedness, took away the common sense of pure science, which was, the force of power used in a round is everything in the battlefield to defeat your enemy, and it was this attitude that lost us the EM series of weapons, way ahead of its time!
If we hadn't had the 7.62 round right across the board on ALL weapons in the Falklands War, it would have been a completely different outcome.
You can be as brave as you like, but without the right combined weapon system, there is in my opinion only one outcome.......defeat!