I had a feeling the "secret confession" was that Oliver secretly enjoyed killing... that his run as The Hood, The Arrow, and The Green Arrow were all a masquerade to subconsciously cover for his enjoyment of inflicting pain and death.
I don't think that's what's actually behind Oliver's "confession", though that is how Prometheus reads it. However, he's
wrong about Oliver.
Oliver's "liking it" doesn't come from the enjoyment of the act of
killing, but the satisfaction of
bringing justice. It's just that by the time he gets to Star(ling) city he spent five years with Slade, Waller and the Bratva in a very cutthroat environment, where killing was the
necessary way and after five years of that the
only way he saw to bring justice to the city.
Prometheus thinks he's using the hero act to mask his killing act, but the truth is opposite, Oliver always wanted to be the hero, but the circumstances that forged him also made him into a killer.
But we know that's
not what he really wants or enjoys, in fact he already stopped out of the desire to be a proper hero. He had a chance to kill Darhk last season, he spared him, turned him over to the system as good heroes do, and the result of that decision was thousands of dead, Laurel among them, a nuked town and almost a total annihilation of the entire world.
That's where his struggle comes form. He's torn between being the proper no killing hero on the one hand, and doing
everything he can(including killing) to protect the people, the latter option being very difficult to ignore or unlearn because it was the only way in the past, it worked, and Oliver never stopped to question it.
Now he is questioning it, and himself, and I think he's going to realize who he is, who he wants to be (a hero, not a killer), and subsequently finally learn to completely disassociate killing from justice.
At least I think that's where they
should be going with this...
