But automatic weapons are not at question here. Semi-automatic weapons are. The use of 'automatic' is a way of playing on ignorance. Using that word when it does not apply marks you, in the mind of the Second Amendment supporter, either as ignorant yourself; or as one who would play on the ignorance of others and thus as one who argues in bad faith for support not supported by fact. (Note the placement of the semicolon.)
How many of the loudest gun control advocates are protected by armed guards, paid either from the public treasury or from vast personal wealth unavailable to the poor inner city resident?
Crime in DC went down sharply after the Heller decision; crime in Chicago went down sharply after the McDonald decision. Would you trade away the lives saved (among poor black people) for the lives lost in these shootings? Remember that in the most recent case, the FBI was warned about the individual's existing threats and failed to act, thus making the deaths in some degree the FBI's fault. (The distinction between kinds of fault are irrelevant to the question.)
The question should be 'Why do young people in today's society become so alienated that they turn to nihilism?'
Remember that before 9/11 the worst mass murder in American history did not involve a firearm. The weapon was a can of gasoline. In the Texas shooting case, the murderer drove past several theaters to one that proclaimed itself a gun-free zone. He wanted unarmed victims. And in the majority of these cases, when the mass murderer meets a competent, firearm-armed citizen, the killer turns his gun on himself--the act of a nihilist already determined to die. (See Peterson's Rule-Six chapter.)
When you say that someone will not listen to your arguments, ask yourself whether you have listened to and understood his. If you reject the more-guns-less-crime argument and the statistics supporting it, why do you reject them? If you reject the Second Amendment arguments, why do you reject them? Have you read the Heller and MacDonald decisions, concurrences, and dissents? If not, do you owe it to yourself and others in this public policy debate to do so? (You can find them online.)