Being ship wrecked on an alien planet has its discomforts—and problems. Like the problem of inducing the local natives, who happened to be divided into two armed camps, to let you get together again!
The trouble with a machine capable of independent self-adjusting operation is, of course, that it may get out of adjustment in a way it decides to maintain—and you can’t change!
A fair green planet will always be bait to the interstellar explorer-colonist type. But when a planet has some mysterious killer-characteristic—then it’s “sucker bait”!