RMSS Spell Law says:
Option 1: An evil spell user only gets the six evil lists as automatic base lists; but he is allowed to choose five additional base lists from that realm’s open lists, that realm’s closed lists, and the base lists of the corresponding profession of that realm (e.g., Magician, Cleric, or Mentalist lists).
Option 2: An evil spell user only gets the six evil lists as automatic base lists; but he is allowed to choose five additional base lists from the base lists of one other pure spell user profession of that realm. Such evil spell users could be Evil Illusionists, Evil Animists, Evil Seers, etc.
Personally I would handle it the other way around. You start with a regular profession and then either take evil lists as your additional base lists or replace your profession's base lists with evil lists. But at the least, there is the option to have them for the other pure professions besides magician, cleric, and mentalist.
Regarding using evil lists vs killing with regular lists, my assumption is that the evil lists are more powerful because you are drawing that power from an evil source that requires doing evil things. Yes, you can kill people with a fireball, but to learn that fireball you did not need to pact with demons and promise to pay them a tithe of the blood of innocents.
If you don't have any moral issues tied into those lists, in my opinion they shouldn't exist at all. The price is the balancing factor, and without the price they are not balanced.