I'm totally against guns, so I'm happy with Japan's laws.
That said, I've heard numerous times over the years that Japan's gun laws are so strict that their hunters are dwendling and wildlife that once was controlled by hunters is becoming a problems, for example wild boars in some places.
So I guess that's a concern. But still, I'm happier without guns around (and I agree with you: given some of the crazies around here, I don't want to think of what it would look like with easily accessable guns)