Littering was a social norm when these chemicals were invented. Even today, most Americans eat meat from factory farms, drive gas powered cars, and throw most trash in a landfill. Problems that will have to eventually be fixed.
If you’re born into this kind of society are you going to handicap yourself by holding yourself to a stricter set of rules than everyone else? The ‘yes’ and ‘no’s to that question don’t fall neatly into class lines.