I think you could argue that any gun incident isn’t the result of a “systemic gun control problem,” gun control just prevents things. It’s a little confusing to say, but a lack of gun control isn’t a root cause of gun problems, it’s just a solution to them (and an objectively good one imo).

While I understand your point, and think it’s fair, I’d add that a part of gun control is the proper education of gun owners such that they have the thought patterns necessary to consider these sorts of possibilities, and to take action to prevent them. It’s a big part of the system here, obtaining a gun licence involves training that fundamentally alters your view of responsible gun use.

That said, I’m not going to pretend that gun control would have prevented this, but it should reduce its likelihood.