No, the problem is, all he had done up to that point was get into some fights. That pretty much describes most 17 year-olds with a Y Chromosome.
Most kids grow out of these problems. This one was able to buy a gun.
He was on the FBI's radar for social media posts claiming he wished to be a professional school shooter.
Even students (and facaulty) at the school knew he made these threats because it was apparently an inside joke to them That they openly commented on in jest. "Cruz is most likely to shoot up the school one day".
Law enforcement failed those students by not acting. Period.
Gun owners have too many protections
One of the things students are protesting
Every student and facaulty member knew Cruz was dangerous as did local law enforcement and the FBI.
They failed to act. The public has been told over and over to report these threats...yet they still do not.
It's was not the gun. It was the failure of multiple people leading up to the incident.
The students are being used by the Democrats and Media to promote their agenda. They are not looking for "solutions". So stop blowing smoke up everyone's ass.