Well, I think it's to remove negative effects from Chaos, such as reducing defense by 50% or freezing for 0.3 turns. That's why.

Yeah, and the next Earth Shock/Freezing Cold/Fireball will fly into those very Paladins, wasting their turn. No wasted turns against a Chaos creature! And you're talking about removing effects... I understand, to nullify a Berserker. But when fighting a Chaos creature, it's only useful if you have a couple of already useless Paladins left. But often, it's easier to attack a potentially dangerous stack than to heal your own in a battle with a Chaos creature.