Spoiler!I think his goal was a bit more towards Anarchy more than the world restarting, He wanted a world of Chaos , Disorder is Order. Ghazar lava bending makes sense if you think it the same way as Waterbending how they can control the temperature of their water, Steam, Ice etc. I'm glad Bolin can do it ;pSpoiler!Yeah but disorder doesn't make any sense. IF there is no law u could do bad things with a good consience. In time there would be villages and everything would start all over again.
Yeah it make sense if Ghazar can change the temperature of his bending nice one lol