So what's the point of including them if they do next to nothing?
One of which doesn't need a crafted or brewed cure and is overcomed by simply standing still or resting.
What's the point in making something that only hurts you for playing the game and can be negated by going AFK?
One is something you'd need to TRY in order to get because it's so unimaginably rare.
Then why include it? If a player catches rabies in hardcore, no matter how rare it is, it's game over. Saying to totally avoid those mobs isn't very reasonable because it blocks off a good chunk of content. But if it's so rare that you'd struggle to purposefully catch it, then why bother using space on it?