Any death is regrettable. I never agreed with David Koch and his brother. They attempted and continue to attempt through innumerable non-profit organizations to turn the USA into a theocracy. They ignore the dangers of the climate crisis and seek old world jobs in mining and on oil fields as a legitimate reason for their multi-national company to remain vital. The fact is the Kochs, including David, have no conscience they only have greed as a motivating force and use some sort of moral definition to justify it. David Koch's heirs need to do better.