[joe_the_user]

Now the industry is giving cancer to poor people and needs to be punished. Who is right and who is wrong?

This argument confuses policy and morality and somehow implies we should ignore both.

Morally, if you spew chemicals you know are going to cause significant excess deaths, you will have to live with yourself and myself and many people will think little of you.

Legality, if you spew an otherwise unknown chemical that you happen to know is quite toxic, you'll be liable. If you stay with EPA guidelines but happen to know this is going to kill or injure significant number, you only have public perceptions and your own conscious to answer for.

Policy wise, the EPA should impose regulations that make all neighborhoods reasonably safe. Moreover, I suggest structuring the regulation process to incentivize creating compliant processes rather than in terms of after-the-fact punishments. (I've heard a variety of contrasts between the US and Europe, where despite the US very "pro-capitalist", the regulatory paradigm is entirely adversarial).