Firing weapons in enclosed spaces while intoxicated is dangerous, full-stop. Arguments over gun control/ownership will never end, but if you do own a firearm, responsibility is called for on your part. Trigger locks are a great idea which could be federally mandated Stateside, but are opposed by the NRA, a powerful political lobby. It's a shame because they're inexpensive and would stop some accidental shootings. But if you're not too drunk to find the key, well...
IMO, the original intention of the Second Amendment (which refers to a "well regulated militia") was to allow citizens to keep and bear arms so this militia would be, well...regulated. It's a different landscape now with the likes of Blackwater...er, I mean Xe. I never thought I would see my govt (yes, I'm a USian) hire mercenaries but there you have it.
Some gun facts: the first overseas US military experience was the Spanish American war at the end of the 19th century. the US also declared war on Cuba and the Philippines (having little experience in empire, they figured they would also declare war on Spanish colonies). The plucky Filipinos had Moro warriors armed with machetes who, even after an American soldier (yes, some were sent there) emptied a .38 caliber revolver into them, would still slice up the soldier. Note: calibers are often named after English measurements, so a .38 is 0.38 inches in bullet diameter. Also note that caliber alone does not determine the velocity or kinetic energy of the fired round.
With the ".38 Special" failing in this instance, a .45 ACP (Automatic Colt Pistol) round was devised. As the name suggests, this round was designed for a pistol (a handgun which contains a spring-fed clip or magazine, usually in the gun's handle, and fires/recoils-reloads-recocks and can be fired again on the next pull of the trigger). This allows for faster loading than a revolver, in which the rounds are inserted into a cylinder which rotates when the hammer is cocked so the round is in line with hammer and barrel, as a clip is faster to replace. Pistols usually hold more rounds than a revolver as well, so the Colt .45 pistol was well received and became the official sidearm of the US armed forces in 1911, and remained so until the 1990s. The .45 round was admired for its "stopping power" and was adopted for the Thompson submachine gun, which was used by police, criminals, and even soldiers in WW2. Perhaps the best film representation of the Thompson is in Steven Spielberg's 1998 film "Saving Private Ryan": the Captain Miller character played by Tom Hanks carries and uses one throughout the film.
A century after its invention, the .45 ACP round remains popular. That said, it really ought not be fired at servers, and except in dire circumstances, at people.