A background check would not have prevented the killer from obtaining the guns.
The rifle was legally owned by his mother. A psychological checkup would have cleared her, but failed to pick up on her son’s illness.
In this case, it was the mother’s responsibility to assess the situation and keep him from obtaining the rifle which she owned. She failed to do that, and paid the consequences, and now 26 other victims and their families are suffering for it.
And she may have been a very well-intentioned human being. But failure to act appropriately in a real-life situation and highly situational lapses of judgment are things that cannot be objectively measured until they happen… and by then it would be too late.
My opinion is that there is no feasible way to have prevented the killings through law. It would have happened either way. A killer will always find a weapon. Restricting access to firearms would not change the fact that people were going to die (although it would change a lot of other things… but I won’t get into that just yet). I just heard of a mass-knifing in China a while ago, no firearms involved.
Guns are not to blame in this situation. What is clearly to blame here is whatever poor quality of life that the man suffered which drove him to commit such a horrible act. The fact that he took his own life shows that he did not care for the glory. It was an intensely personal act. Secondly, his mother either could not or would not successfully understand his situation. Had his mother done her duty as legal owner of the firearm, and kept it out of his reach, many people could have been saved. Lapses in judgment can be deadly.