The story of Gunns is a parable of corporate hubris. You can, as they did, corrupt the polity, cow the media, poison public life and seek to persecute those who disagree with you. You can r-pe the land, exterminate protected species, exploit your workers and you can even poison your neighbours.
But the naked pursuit of greed at all costs will in the end destroy your public legitimacy and thus ensure your doom. Gunns was a rogue corporation and its death was a chronicle long ago foretold. The sadness is in the legacy they leave to Tasmania — the immense damage to its people, its wildlands, and its economy.