Maybe not wanting to compromise the state of absolute self control. Also there is the worry about good manufacturing practices and content uniformity. There is no one to hold accountable for adulteration of the product. The rare conservative drug head uses prescription drugs, calls the Drug and Poison Information Center to assure themselves of the identity of thesubstance, and will eventually be driven straight by the worry. All congenital conservatives believe in a Supreme Being, have a religion and go to some kind of church.
Tradition is a conservative thing.
Conservatives are into rules, and a concept of absolute right and wrong. The Ten Commandments are fairly popular among western conservatives. Rules take precedence over feelings. Happiness can even be found in the process of delayed gratification. That thought naturally leads to the phenomenon of sexual conservatism.