destructionist

noun2

1. •
   (disapproving) One who delights in destroying that which is valuable, or whose principles and influence tend to destroy existing social, economic or political institutions.

   • The foreign and literal warfare, meantime, is a thousand times more desirable than the intestine warfare between the Destructionist and the Conservative. — 1841
2. •
   One who believes in the final destruction or complete annihilation of the wicked; an annihilationist, a conditionalist (i.e., a believer in conditional immortality).

   • The great Dr. Watts may be considered, in some measure, a destructionist; since it was his opinion that the children of ungodly parents who die in infancy are annihilated. — 1807