Should someone have, say a "semi-automatic" Ak47, and I have my bolt action single shot .50 cal precision rifle, who do you think is more likely to survive if we engage each other from 1000 meters?
Flip that around, who will survive if we bump into each other at a corner?
Lethality of certain type of firearms is dependant on many factors, as each type have advantages and disadvantages if you wish to think of firearms with a "how many people can they kill" mentality.
FYI nearly all pistols are "semi automatic" sirloin, so your points were a bit conflictory, but no big deal.
I introduce thousands of first time shooters in Calgary to everything under the sun, pistols, shotguns, "assualt rifles", etc. Any firearm can be incredibly dangerous in the right/wrong hands. Trying to divide firearms into more or less lethal types is the mistake of the misinformed generally.
Regarding the penalties Sirloin, I'm in COMPLETE agreement.