"At baseline 93% of homes had at least one unlocked gun in the home."
There aren't many places in the world like rural Alaska, so maybe this study won't generalise. But I like the drive to action: firearm suicide is a major problem, and gun cabinets may help so let's do the study. The trial was randomised with a wait-list comparator, a common study design where you have ethical concerns about denying the intervention completely to the comparator group.
The result was a process outcome - guns locked away - rather than the health outcome we want (less suicide).