I have bad news for you: all firearms are designed to kill. It seems you are more upset that the kooks have a choice than you are what they do with the weapon they bring to schools.<quoted text>"Legal Weapons", and therin lies the problem these gun nut choose these weapons for their effectivness in killing as many people as quickly as possible before they are stopped or stop themselves.
I focus on these assult type weapons due to simple fact they are used for one thing, to hunt people. In most cases they are chosen to kill children.
Also I focus on these weapons because your examples primary uses are in other areas baseball, manual labor, etc. With your examples the killer would have been stopped before he killed 26 people and himself. They would be much harder to regulate than one weapon whos primary purpose is to kill.
This is why I have doubts when people like yourself claim they own firearms. If you did own firearms, you would realize that a semi-automatic 9mm could have killed those 26 people just as easily as any assault weapon. It only takes less than two seconds to drop a clip and insert another one.