It's about motivations, or, in bad cases, necessity. About necessities (like not going bankrupt, or feeding a hungry tribe by claiming the land of your neighbor, etc) I'm not sure much can be done. But I do think it's about profits when it comes to corporations. Shareholders are often relatively passive and in it for the money, they aren't "mission driven" (being the best at one thing in your industry, spearheading a new way of transportation, etc). Their field or artisanship isn't their motivation, the profit is.

When you're designing a new engine, you might decide to use 10% more expensive parts to make it 20% more fuel efficient, but this additional cost might result in 10% lower sales, so the board decides against it since exhaust is just an externality. If those people were considered with ecology they might consider a lower rate of profit but instead take pride in the fact that they're helping humanity combat global warming while maintaining the standard of living.

It's easier to rationalize away "bad things" when making money is at the top of your value scale. I think it resembles the individualism of our age, people used to be more aware that they were a cog in the machinery of history, no one thinks like that anymore, it's all "be the best you can be" rather than "be the best we can be".