Should a mentally ill person be able to take a gun to a political rally?

People who advocate unfettered access to guns for all Americans how about the rights of the individuals without guns who are peaceably assembling….do their rights matter less than the person carrying the gun?  It is clear that the laws concerning access to guns are not stringent enough in that they do not prevent the mentally ill from getting guns and causing unspeakable tragedy to our communities and the nation.  However, whenever the slightest protection is proposed the NRA is on the march through the halls of Congress claiming to its members that the government is trying to take away our guns. 

Unstable individuals are obtaining guns and taking them to gatherings the very nature of which are likely to involve flared tempers.  A clear recipe for tragedy even in the mind of reasonable Second Amendment purist.  How do we prevent it from happening?  One way is to recognize that the people who sell firearms are the last line of defense and prevention when it comes to catastrophic events such as what happened in Tuscon, Arizona.  It is clear that the existing gun buying disqualification databases are not being updated as they should when it comes to the mentally ill.  And what if someone has yet to be diagnosed as mentally unstable?  Should he/she be able to buy a gun because their psychosis has yet to be discovered.  Why not have some sort of exam that individuals must take at the time of purchasing a deadly weapon. We have test for individuals before allowing them to drive a car, another type of deadly weapon.   Why not also have such a test for the deadliest of weapons.  Congress must provide the tools necessary for sellers to keep guns out of the hands of deranged and psychotic individuals.  It is possible to do so without weakening the rights of sane Americans.