> The type of guy who does not believe externalities and costs to society are [real]

There's a whole political movement (and maybe others) based on the idea that society (and especially governments) should not regulate activities which produce externalities.

For example, if $CORPORATION is big enough, people who need jobs have little choice but to accept a job there. If the company's pay and benefits are too low, family members, local non-profits, and government agencies have to shoulder the costs that rightly belong to the corporation.

The proper response is for society and government to regulate pay and benefits, so that the company doesn't export its rightful costs onto the rest of society.

If $INDUSTRY has a high rate of injuries, the rest of society gets to cope with the impact of those injuries. In that case, society's proper response is to regulate that industry's safety, to prevent the industry from imposing a cost upon society as a whole.

If $FACTORY releases pollution (such as environmentally hazardous substances) into the air and water and the ground & ground water, there is a delayed impact to society. In that case, society's proper response is to force the factory to deal with its toxins instead of releasing them ... and to force them to remediate those already released.

Unless you live in a cave, dozens of miles away from anyone else, the things you do can affect others, and those effects can lead them to wish to restrict your activities.