Argument: There is little public support for a mission to Mars
"Mars beckons." Cumbrian Sky. July 21, 2009: "THE PUBLIC AREN’T INTERESTED IN SENDING PEOPLE TO MARS. There. I’ve said it. We were all thinking it, but no-one was saying it. Time to face facts. There is, at present, NO public demand – or even support – for a manned mission to Mars. They think it would be a huge amount of money spent for absolutely bugger all practical use. And until space enthusiasts and the space community, and, yes, NASA itself, can give the public a damned good reason for sending people to Mars and not just more rovers, WE ARE NOT GOING TO MARS."
"51% Oppose U.S. Manned Mission to Mars." Rasmussen. July 21, 2009: "Fifty-one percent (51%) of adults are opposed to sending someone to Mars as one of the current goals of the U.S. space program, according to a new Rasmussen Reports national telephone survey. Twenty-one percent (21%) are not sure."