Of course the staff were all furious at hearing this, which he seemed to enjoy. I asked the other owner if he was serious and he said he 100% was serious. So I approached the owner dumping the oil why he did this, why he didn't just empty the oil into a container, etc. Long/short he said it didn't effect him and couldn't care what any of us hippies though of the practice.
I would say that there is a fundamental difference in the way people are; they either view things in the long-term and strive to ensure the best for all of us. The other side of the coin are people that just want what's best for themselves and maybe their family. They don't care or want to believe such actions have long term effects on them directly.