Fortunately, an atheist, I don’t have to care about either the Bible or the theology of the Catholic Church.
As for hatred, if it really is something good, then how is this hatred to manifest itself? How is hatred helpful. Of course, when you have enemies that are truly evil and that in fact hate you, it would be expected to dislike those enemies, to fear them, to have anger towards them and to use violence if need be to defeat them.
Hatred seems to be more than that. It seems that if you hate someone, you want to hurt them even past the point when they have the ability to hurt you, above and beyond merely retribution or deterrence, but to harm the object of your hatred.
If hatred is merely the appropriate reaction associated with a threat, then such a strong negative emotion isn’t needed, merely a reasonable amount of force to end the threat. Hatred can motivate actions that you shouldn’t be engaging in, both because those acts can ultimately be self defeating and because it make make you evil as well. The first step in opposing evil isn’t to hate evil but to not be evil yourself.
To quote Friedrich Nietzsche: “Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you.”