Paintball is NOT SUPPOSED to be militaristic, but unfortunately there are a bunch of people out there trying to turn that around. If you wanna see something that really pisses me off, go to http://www.battlepaint.com
Maybe you should listen to what your parents are saying. Then just tell them that you'll save up your money, buy cocaine, and sell it at a higher price, thus becoming a drug dealer and starting up a lucrative business. Before long you will be making $5,000 a week and have more than enough for paintball, and plenty of cash in the bank.
OR, you could go all legal and just turn your parents arguments around on them. Paintball is not like the Capitalist Army (United States Military). You can learn leadership, teamwork, and good sportsmanship from both, but paintball utilizes those traits in a positive way, whereas the Army is just out to ****in' murder people.
If your parents are worried about you becoming one of those right-wing paramilitary racist hicks that set up bomb shacks in Montana, then just go out and start yelling stuff about how the right-wing of the political spectrum is determined to destroy the United States.
A couple other things that might help - How old are you? Are your parents anti-gun freaks (like myself) or pro-gotta have an M-16 in every room and hallway? Are they capitalist pig-dogs or liberal, or what? And write down their entire anti-paintball lecture.
By the way, practically everyone I know is allowed to hold my Autococker, as long as they don't brake it or destroy it in some fashion.
As for someone claiming they'd like to blow someones head off with a shotgun, to that all I can say is I hope you get banned from what ever paintball fields you play at if that is your attitude.