Can someone tell me where in the 2nd amendment it says you can carry machine guns?

[Nanny]

Brian, I'm surprised by your comment. 

There's a Philip K. Dick story called Minority Report (made into a bad movie) that posits a society where "precrime" is a punishable offense. A means is devised to determine probability of any individual committing a crime. The surveillance state takes these probabilities and acts on them to arrest and punish people for potentially committing crimes. It's a dystopian story about a police state.

I'm not suggesting that you meant this, but when you say that you have a family history of mental illness, and suggest that should disqualify you from exercising your rights, you're making a very bold statement. It presumes that we are not free to make our own choices and to act in accordance with those choices. You're saying that because you could snap at some point that you should forfeit a right guaranteed you by the Constitution. 

This isn't about just 2A, then. If your argument is real, you could make the same statements about anything. Your very lot in life could be decided based on heritable traits and tendencies. That sounds like genetic stratification, or eugenics. That is terrifying as history proves. 

I appreciate that you enjoy debate and I've been impressed with your statements in other threads. I'm hoping you'll reconsider this aspect of your approach.

Edit -

If your self-assessment is accurate, then it is good of you to acknowledge that the responsibility of gun ownership is not for you. Just because you've decided that you are unsuitable to own guns doesn't mean that no one is. With the millions of guns in this country - the vast majority of which will never do harm to any person (statistics prove this) - it truly is the exception when some slob does something horrible with a gun to themselves or others. There are 300+ million people in the USA. A fraction of those own guns. A very small fraction of those use guns to harm others other than in self-defense. Applying your individual situation to the vast majority of law-abiding citizens is wrong.

It's like climate-change deniers who confuse daily weather with long term climate. Yes, the weather changes day-to-day. The long view describes the climate. Climate deniers will say, "global warming, eh? how come I got a foot of snow TODAY?"

False dichotomy again. Incorrect understanding of terms.

Holy crap, nobody is suggesting Orwell's 1984 or even "Minority Report"........

Prevention is not the same as presumption of guilt. You have to go to medical school to get a degree. You are NOT presuming the person making the attempt to get the degree is evil, you are simply insuring they can handle the job.

"Legal at time of buy" does not insure that the person walking into your gun shop does not have any problems at time of buy. Vetting to insure the wrong people don't get firearms is NOT taking away anyone's rights. 

If you are a business owner, you don't simply hire anyone, you make the attempt to look at their record of work history and get references. Nobody would want an airline to hire someone for the position of pilot who never took flying lessons.

Apologies. I misunderstood your post.