This conduct is the same as that proposed by many fundamentalists elsewhere in the world from biblical morality.
Yea, don't ya think that if the fundies could get away with "eliminating" gays, athiests, evolutionists and anyone else who threatened their belief system they would do it and find some way of justifying it with the Bible?
Not unlike the WTS view on apostates:
Being limited by the laws of the worldly nation in which we live and also by the laws of God through Jesus Christ, we can take action against apostates only to a certain extent, that is, consistent with both sets of laws. The law of the land and God's law through Christ forbid us to kill apostates, even though they be members of our own flesh-and-blood family relationship.