Offline
Seems to me that you're presuming that we cannot attain information about Mars without actually putting a man on the planet. I don't think Columbus is a good analogy - 15th Century Europeans had no way of discovering what was out there, sailing west. We, however, have landed several Mars lander missions that have gathered quite a bit of data, taken images and video, and brought back samples. I'm just wondering what it is that a manned mission is going to "figure out" that we can't otherwise do. If there's something, then perhaps it's worth it. I just don't see it at this point.
(I'm not questioning your conclusion - it's a matter of choice. I'm only questioning the premises stated).
If we are going to survive on Mars, we must have somebody be the first to go. Why wait? Can humans survive that long of a trip? What ill effects will they suffer? What unforeseen obstacles await us? And darn it, it will just be cool to be the first country to put a man on Mars.
Most importantly, how will Google make a complete street view map of Mars without a human there driving the camera car around?