Eveyone can be tempted by the lure of having their wishes granted, and Mr. White (although skeptical) does not want the paw destroyed before he can see if it works. Morris, having used the paw, says he kept it to possibly sell it. But the implication is that he kept it to remind himself that men should not tamper with powers they cannot control.
this is because morris wants to destroy it so other people wont use it and the whites were tempted
All humans share common ancestry with monkeys, so it is only logical that as a species, we should resemble monkeys. Caucasians are not the only ones.
Appalachian mountain whites
Mr. and Mrs. Whites, Herbert, Sergeant Morris, and the servant from the factory.
Mr.Morris seems scared when Mr. White asks to keep the monkey's paw.
The whites see an empty road in the lamplight
Suprised
His name was also William, mother's name was Emma.
Major Morris throws the monkey's paw into the fire to try to keep anyone else from suffering because of it. He had kept it after using it, but now wants to destroy it, so that no one else would tempt fate by using powers beyond their control. White grabs it from the fire, and later uses it, to his lasting sorrow. (see the story at the related link)
He thinks it is a big joke
the second wish in the monkey's paw by Mr. White is "I wish my son alive again"
He thinks it is a big joke