Magic is magic and no differential should be made between the two.
A lot of people who take part in magic are scared of so called Dark
Magic. It will come back on you threefold we are told.
If a person has wronged you or a loved one seriously enough then attempting magical attack is fully justified. Just be sure that during the spellcasting you are positive that you are doing the right thing, and with a rightous anger.
Otherwise you may cause negative energy and the spell may well rebound on you.