Usual think of the children stuff. Basically, someone who shouldn't have a permit could hypothetically get one and then go on a killing spree, so we need to give police and sheriffs full powers to deny them. If I remember rightly, one of the main things the American gun control movement has been campaigning for is the removal of shall-issue policies which require police and sheriffs to issue permits like these unless they have a specific legally-defined reason not to, and replacing them with the kind of may-issue policies that allow arbitrary denials and this sort of corruption - and they're quite happy to point at dead kids and accuse anyone who gets in their way of supporting child murder to achieve this.