I can't be certain of what you're specifically referring to, but the destruction found in the book of Revelation, in general terms, is the destruction of sin.
evil (antichrist) deceives every one and calls him self god then brings nuclear war to the earth and you call him good?
god destroys all the evil people (antichrist and his followers) on the earth when he returns
if he doesn't the evil person (antichrist) will wipe out all of humanity on earth
yes god is good he stops the evil and wicked people in judgment