Why can’t people visit Antarctica as they please. What is going on down there that access is strictly limited? Let the sojourner beware.
Because the idiots aren't prepared for the conditions and many will die there and put the lives of those who work there at risk.
The people who work there aren't paid search and rescue teams and if they have to go out and risk THEIR lives looking for every fool who gets himself in trouble, they'll never get anything done.
Plus they're not getting paid for that risk. It's not what they signed up for.
Besides, seeing what damage *tourists* do to an environment with no oversight, they're better off being kept away than destroying the last virtually untouched ecosystem in the world.