Depends on the state and the gun. So far as I know, you may own one - or a dozen - hunting rifles or shotguns in virtually every state. The laws on handguns are a lot more strict, but again, it varies by state. In my state (Michigan) you need a permit to buy a handgun, but once you get the permit, you can legally buy and own that handgun. For every additional handgun, you would need an additional permit to purchase. You can own it. But you can't carry it - that is a separate permit, a license to carry it. But basically, if you have no criminal record, you can get that without a whole lot of trouble. If you have neither (in Michigan), owning a handgun is illegal, with only a very few exceptions. The laws vary by state - you need to find out exactly what they are in your state.
No, it is generally illegal to possess guns in international waters without proper authorization or permits.
No. There was crime before there were guns. I collect guns. My children and grandchildren are hunters and target shooters. I do not commit crimes, nor does my family. People that want to commit crimes will do so, with or without a gun.
Because they think if there were no guns, there would be no crime. Unfortunately, there has been crime since long before there were guns.
There are no permits required for paintball guns.
It depends on what you mean by "better." There is no evidence that indicates crime would go down if guns were banned. People were killing, crippling, and robbing each other LONG before guns existed.
Presumably legal. There are no solid statistics to indicate what the number of illegal guns are - it can only be estimated. Also, there are very few guns that are illegal. This would include only machine guns and destructive devices without proper paperwork. Most guns used in crime are legal to own by normal people, but in possession of what is called a "prohibited person". Felons may not possess guns, but it is the felon status that makes this a crime, not the gun.
You are stating an opinion- and I have a different opinion. While guns CAN be misused, that is the person, not the gun. Guns permit a person to defend themselves without regard to how strong or how big they are. Statistics indicate that guns are used for defense FAR more often than for crime.
A typical security guard is not allowed to carry a gun. There are security guards that carry guns, but they must get additional permits and training for this. Guards without guns can do what is called a private arrest. Security guards with guns generally work for the government, military, casinos or some other money bearing entity.
crime, safety, food
No, as it is illegal to buy guns without a licence, gun ownership is far lower. You do get gun crime in larger urban areas, but this tends to be confined to the worst areas of the cities.
Without
There is no place in the US that requires a permit/license for paintball markers.