RPG would be better than the laws rocket? I have no experience with either.
The thinking as I've heard it is, "Screw all this marksmanship stuff. Especially with conscript peasant soldiers, (the same guys who had AKs yesterday), or with just a mob of Somali tribesmen chewing that homegrown loco weed for example, just let 'em launch a fragmentation bomb at the Americans and see if they can hit close enough to frag them. Close with a rifle is a miss; close with a little frag bomb is a hit."
I think that might be what the question was in this case. In our case, our military would probably arm our troops with frag bombs when they can be high-tech frag bombs that cost a lot of money, re the new infantry weapon we've been hearing about, with the 20mm (IIRC) projectile with the time-delay (I think) frag projectile warhead thingie.