I don't know about that, 2100 is a long way away. I don't think humans will make it there before 2037, but I would bet they will before 2100. If I had to pick a year I would say 2050.

NASA always admits spaceflight is dangerous. They have to. If not, then what's to stop the criticism from the public and congress for failing to admit any disclosure of risk when accidents happen that result in astronaut fatalities. In other words they have to cover their rear. Not to mention that it is obviously dangerous to put someone on top of a potentially explosive rocket.

I also don't agree that a private company will land on Mars before a nation. Maybe a 'teaming up' of public and private may occur, but not solely private. NASA is way ahead of the private sector (already has landers and orbiters at Mars) so I just can't see a company with a smaller overall budget surpassing NASA.

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