Many states want to limit the distance that a projectile will travel in deer hunting areas because of flat terrain and/or the proximity of the hunting area to houses. Therefore, they have "shotgun only" hunting areas - I fail to see why safety concerns are "screwed up.
OK, there's nothing wrong with safety concerns. I was speaking more to the technical issue. Rifled slugs are less accurate than bullets from rifles. Bullet technology for the last 100 years has pretty much proven that to be true. So maybe you can tell me why someone would want to use a smooth bore 6 MOA slug gun for shooting medium game at short ranges rather than a 3 MOA straight wall cartridge in a rifle. About the only reason I can think of is it's cheaper because you can use one gun for two types of game.
Both have about the same effective range. That's why some states are making straight walled cartridges legal and old timers used them instead of shotguns.