Re: Well, he might have a point, but...
"but fixing THAT problem is the job of politicians and philosophers, not scientists. Dropping it at the feet of the people who just want to figure out how to go to Mars is both unfair and unlikely to result in good solutions."
I'm sure those scientists that worked for the Nazi's and Soviets said the same thing, these things need to be considered, a new Mars colony would be very remote from Earth Government or regulation, scientists have as much a role in this as anyone else, and being a specialist in say habitat creation or recycling does not absolve you from making moral decisions.
If the person in charge of a future colony decides slavery or cannibalism is acceptable the scientists or anyone else involved need to take a stand or build in safeguards to prevent abuse.