Lord Jesus has advised that it is incumbent upon us to lay aside any desires to condemn and punish sinners, and to ensure that any attempt at reprisals against sinners is contained. Everyone who has ever inhabited the earth plane has at some point behaved atrociously – no one is without stain of sin.
Prostestant Christians are probably the greatest sinners themselves if you telly the number of innocent non-belivers including Catholics and Muslims that they have condemned to hell and fire.
If you do a head count of Catholics, Muslims, Buddhists, Taoists and other non-belivers in the whole world, the number of innocent souls they have condemned is in billions.
The very thought itself is wicked and non kind-loving.
Maybe they believe the more they condemned their place in heaven will be more secured. Or hoping those souls will get converted out of fear to get their tickets to heaven(the prominent selfish reason of a convert).