Disregarding externalities is the essence of free market dogma. Whether it's pollution, cheating customers, forcing unpaid overtime on employees, unsafe workplaces, collusion and price fixing. It's a disastrous race to the bottom unless "Big Government" puts rules in place to get companies to engage in positive-sum behavior.
And that's the key issue. Positive sum (along with "first, do no harm") behavior is what makes societies healthy and prosperous. Laissez faire free market capitalism rewards extractive actions over positive sum actions with predictable catastrophic consequences.
