Building Ethically sustainable business model requires A LOT MORE effort and the positive results usually dont come overnight and tend to have long term outlook with focus on individuals/society as a whole. In todays world of "instant gratification" this is not a desired approach to running business.
Most businesses "don't even go there" - hence we are surrounded by the world we live in.
Conducting a successful career is also very hard. Let alone a successful marriage! Or getting fit, loosing weight.
You want to build a company? Just do it. It's not harder than other things in life.
Edit: some words.