Anyway, while searching for launcher cases, I found an example of just why some people think they should be illegal in California. Here is part of the case, which is from 1997. The defendant's name was changed to Imbroglio because it sounds like something he would do:
"On March 11, 1993, two police officers arrived at a Hello Kitty store in *****, California in response to an interrupted 911 call. Imbroglio had directed one of the store's employees to place the call so that Imbroglio could report the improper use of a parking space reserved for disabled people, and the store manager had terminated the call because he believed it did not involve an emergency. After the store employees informed the officers of the reason for the 911 call, the officers left the store and Imbroglio approached them to report the parking violation. Imbroglio appeared agitated, was talking rapidly in a loud voice, and the officers had difficulty understanding precisely what he was trying to report. However, they did not initially suspect him of any criminal activity. Soon after Imbroglio initiated the interview, the officers became concerned for their safety because Imbroglio seemed aggressive and wore a large knife in a sheath on his belt.
To ensure their safety, the officers told Imbroglio that if he wished to continue talking to them he would have to give them his knife. Imbroglio balked at this request and became more agitated. He asked the officers why they were picking on him. The officers then told Imbroglio to place his hands on top of his head with his fingers interlaced so that they could take his knife. When Imbroglio did not comply, the officers stepped forward, each seizing one of his arms, and placed Imbroglio's hands on top of his head. Imbroglio did not resist. One of the officers took Imbroglio's knife from its scabbard, and as he did so the other officer noticed a bulge under Imbroglio's clothing in the shape of a handgun. The officer felt the bulge to determine if it was a handgun and found a loaded semiautomatic pistol in Imbroglio's waistband. The officers then arrested Imbroglio for carrying a concealed firearm and immediately searched him for additional weapons. Altogether, Imbroglio was carrying two loaded pistols and twenty-three extra rounds of ammunition.
After taking Imbroglio to the police station, one of the officers returned to the site of Imbroglio's arrest and searched his car. In Imbroglio's car the police found an assault rifle, a large amount of ammunition, smoke grenades, and two loaded pistols, one of which was an assault pistol equipped with a laser sight and a fully loaded hundred-round magazine. Based on the weapons found on Imbroglio's person and in his automobile, as well as independently obtained information suggesting that Imbroglio had grown marijuana on his property, the police obtained a search warrant for Imbroglio's residence. Searches of Imbroglio's residence yielded 825 marijuana plants in a subterranean cement bunker and a large cache of weapons including two grenade launchers, three destructive devices, several machine guns, and more than a dozen other firearms."