gb,
You make good points. Allow me to state my case.
The reason I say move laterally is that it is easier and quicker to move to cover on your feet and return fire while running than it is to roll to cover and return fire while rolling. Of course, this all situational, and depends a great deal on how close cover is.
The argument for suppressive fire is merited, but I see it as a risky prospect if your enemy decides to follow you anyway, and you have a limited amount of ammo. I carry 7+1 and a spare magazine or at other times 5 plus a speedloader. Your argument to get off a couple of shots to change the initiative has a lot of merit though. That is why I train to shoot while moving. I want those shots to be as accurate as possible. My argument is against shooting wildly, which opens up a whole 'nuther can 'o worms.
