I agreed with that. And I pointed out they are just as bad a shot with 6 in the cylinder as they are with 15 in mag. You can just do a lot more damage with 15 errant shots. But there are also a lot of good shots in LE and the Military who can take very good advantage of the extra rounds a semi-auto provides. I like your earlier suggestion that LE should be required to practice with their firearm regularly. I think at a minimum an hour on the range every week. And perhaps have them evaluated each time by an experienced range master.
If they only have six (6) rounds, they might actually stop and think about it. And maybe even practice a little more.