They claim a lot of success with their methods.And it may be a lot cheaper in the long-run to do things this way.
The great part of this for us (in addition to the commendable reduction in human suffering), if it does indeed work, is that it proves it's the people not the weapons that drive crime. Of course *we* already know that, but imagine if this and other like groups got all the funding they needed and they reduced both street crime and mass-shootings to a negligible amount.
That would take all the focus off of guns and the controllers would lose a huge, perhaps the biggest, rational for their policies.
With that gone, how could they generate the emotion they need to push their views forward? They'd lose a lot of folks in the middle and there's not enough full-ban-of-all-guns types to matter politically.