While persona ego self, within our body, is firm in the belief that our shadow self, projected outside of our body, is 'not me', there is a sense of separation between the two and there is war and conflict.
In this condition, the in-here self will not want to claim ownership of the projected shadow content (guilt etc) because it *appears* unwanted. The persona does not like to accept things that it does not want, it focuses on rejection in order to include selectively.
So while we're in this state, with stuff projected, it will APPEAR to us that what we projected is terrible, bad, unwanted, hated, unforgiveable, evil etc. And because it appears that way, nobody in their 'right mind' would want to claim ownership of it.
However, it ONLY looks that way BECAUSE the persona is trying to reject it, condemn it, judge it, and get rid of it. If the persona in our mind, in our body, was not perceiving our 'self' as being intensely opposed to the projected 'out there' self that is our shadow content (guilt etc), then this IMPRESSION that the shadow is an evil external enemy would not be perceived. But this would also mean the inner persona self would not be able to see itself as a separate limited identity of 'goodness and innocence'. And it doesn't want to give up that facade.
So it's really only because the persona and shadow are kept SEPARATE and (as in a split mind) are war with each other, that it seems they appear to each other as enemies. If they were NOT kept apart, but instead came together as a unified, ONE SELF, the separation would dissolve, the impression of evil enemies would disappear, and we would not see that projected self as evil or attacking us.
In other words, the secret here is.... your enemy only seems to be an enemy while you choose to PERCEIVE them as an enemy, and if you weren't doing that, and you weren't putting walls up between you, and you weren't attacking 'them', you would simultaneously realize that they are no longer seeming to attack you. And this is how the two become one, and the persona and shadow then dissolve into each other and are undone (which means the whole ego is undone, because the ego is a split mind), and what is LEFT is the personality which is your real self.
What seems like a scary monster behind the door only seems that way while the light is off. Turn on the light, the light of truth, the light of awareness that you are BOTH the persona and shadow and that really you cannot be against yourself, and the fear and horror and conflict must melt away. Instead you find peace.
I hope I am clearly conveying what the ego's TRICK is here.... it is only an illusion that your enemy is your enemy.... it's really the separation BETWEEN the two of you that is the problem, and it's making them seem like an enemy. 'They' are really the other half of yourself. The two need to come together and stop being separate and against each other, which means the persona has to stop rejecting and attacking and being conditional, and the shadow has to stop doing the same. Then you are of one mind, a whole mind, which is at peace, realizing it was the war that made everyone look like enemies, and really both sides were innocent all along.