Having miracle on at all times would be too much of a buff. It would allow you to have hatred and all bonuses from all Star, moon, and sun spells on 1 target. Instead of having just hatred and the buffs from only star, moon or sun on the target. Not all 3.
I'd say either an npc to reset the status, or making the hatred skill be re-casted to change targets for each level of the hatred skill.