these people did not have mental health issues
I agree. These are angry people lashing out. Agree, it is insane what they do, but they have their reason for their madness, same as terrorist do and same as nations that drop bombs and kill innocent people and Presidents and Dictators and Kings and Police that have tortured and massacred people--and they have gotten away with it. Is that mental illness? People get angry, people get outraged, people lash out, either individually or in groups--but is that mental illness? Will gun control help the problem? I think that maybe a little, but it depends on what that means. In cities that regulates guns, any criminal can get get guns, for example, in NYC, there is gun control , but armed robbery with all kinds of guns was rampant for decades. The only people unarmed were the law abiding citizens and the victims of the crimes. About a year ago, gun control did not stop a madman for shooting 2 PO sitting in their car and then killing himself. That killing seemed like retaliation to me for the innocent man that was killed accidentally by a PO. If the government wants to do gun control, it has to be like how the Cubans got rid of all the guns in their country. They told me that even the police did not have guns. However, if gun control means like they do in some US cities, it does not mean anything. Anyone that wants to commit a crime can get a gun and lash out or do what he wants. Drugs like Heroine and Cocaine and other "Schedule" substances are controlled, but people get tons of it.
Should you blame the newspaper when they publish about abuse of power and oppression by some people in office, for example, a news article I read stated that some prosecutor in Texas was found guilty of malicious prosecution, putting a man in jail for about 20 years (not sure if it was 40.) Although he enjoys immunity, he was sentenced to about a day in jail. (I wonder if he survived. Did not read any more about it. But they probably put him in protective custody for the day.) But are the newspapers doing wrong in publishing and exposing injustice and abuse of power? Should they be blamed when people lash out?
Regarding the lowering of violent crimes in the US to 50 percent, I think that is true reflecting armed robbery and drug killings, gangs, organized crime, and the such. The killings now are from inspired terrorism, and retaliation motivated killing sprees, and acts of vengeance. Is that mental illness? That is the Defense's theory.