Passage Summary: An engineer defends polluting a river by saying he's willing to swim in his own mess and wouldn't mind if everyone else did it too.

Conclusion: The decision to dump chemicals into the local river was acceptable.

Reasoning: The engineer is willing to personally face the risks of his actions and believes the action would be fine if adopted as a general practice by others.

Analysis: The engineer is using a version of the 'Golden Rule' or Kant's Categorical Imperative—essentially saying an action is okay if you're willing to be the victim of it or if you'd let everyone else do it. Look for a principle that links the morality of an action to the actor's willingness to accept the consequences or to see the action universalized. It's a bold move to defend pollution by saying 'I fish there too,' but logically, that's the principle he's leaning on.