question:  Why does Matt feel the need to warn people about the Chingsi?
context: Illustrated by Schoenherr The wind howled out of the northwest, blind with snow and barbed with ice crystals. The sun glinted on black rock glazed by ice, chasms and ridges and bridges of ice. It lit the snow slope to a frozen glare, penciled black shadow down the long furrow, and flashed at the furrow's end on a thing of metal and plastics, an artifact thrown down in the dead wilderness. Two months later your time, one second later by us. Matt Hennessy, from Farside Observatory, back of the Moon, just back from a proving flight cum astronomical survey in the starship Whale . Walking, talking natives on a blue sky planet with 1.1 g gravity and a twenty per cent oxygen atmosphere at fifteen p.s.i. The odds against finding Chang on a six-sun survey on the first star jump ever must be up in the googols. "The Chang natives aren't very technical—haven't got space travel for instance. We were able to show them our sun, in their telescopes. "One, they learned our language in four weeks. When I say they, I mean a ten-man team of them. "Two, they brew a near-beer that's a lot nearer than the canned stuff we had aboard the Whale . "Four, the ten-man language team also learned chess and table tennis. People who talk English, drink beer, like jokes and beat me at chess or table-tennis are people for my money, even if they look like tigers in trousers. It was more that we all seemed to make silly mistakes when we played them and that's fatal in chess. Of course it's a screwy situation, playing chess with something that grows its own fur coat, has yellow eyes an inch and a half long and long white whiskers. He was called—well, we called him Charley, and he was the ethnologist, ambassador, contact man, or whatever you like to call him, who came back with us.
output:  Matt is convinced the Chingsi are bad luck.
options:  Matt is convinced the Chingsi are bad luck.  Matt is convinced that Charlie deliberately destroyed the Whale.  Matt is convinced the Chingsi are evil.  Matt is convinced that Charlie deliberately destroyed the Minnow.