When homeowners are allowed to legally DIY and faced only with modest permit fees and difficulty, they will pull permits and submit to an electrical inspection. When the inspector finds unsafe work, he makes the homeowner fix it. Lives are saved.

When homeowners are not allowed to legally DIY, they will still DIY anyway because it's unenforcible and without any oversight. Dangerous installations go uninspected, and lives are lost.

NZ's experience makes perfect sense- outlawing DIY electrical does not stop DIY electrical work, and only serves to make it more dangerous. Don't outlaw it, provide education and oversight, and make it safe.