How does Tom encourage his own destruction?

He routinely is happy benefiting from someone else's misfortune. After he made his bargain with the devil, he set himself up in the business of usury and "helped" everyone which was only a benefit to himself, thus making money hand over fist. He also, as he grew older, regretted his deal with the devil and thus became a religious zealot, considering to "feather" his eternal bed by condemning those other religions (i.e., Quakers) which were different from the religion of Boston.