Identity Crisis is a tragedy about realizing that the friend you believed—before he betrayed EVERYONE—to be good, decent, the best and the brightest, had in fact betrayed YOU long before that.
After Hal became Parallax, Bruce defined Parallax as not the Hal he knew.
He drew a clear line between Green Lantern Hal and Parallax Hal, idealizing the former. More than anyone else, Bruce found it impossible to believe that “the Hal he knew” had betrayed them.
Bruce suffered Hal’s betrayal more deeply than anyone. From Bruce’s perspective—someone who constantly stood at the edge of falling himself—Hal was the one person who should never have fallen.
If Hal could not be trusted, then Bruce could trust no one—not himself, not anyone else. That belief became the seed of his paranoia.
Of all the people wounded by Hal’s betrayal of the League, Bruce was the most deeply hurt.
And yet, Bruce forgave Hal. He gave him a second chance.
That forgiveness, however, did not last.
Because Bruce later regained the memory that GREEN LANTERN HAL had once betrayed him.
The PAST Hal he believed to be the best, the brightest among us was not fundamentally different from the Hal standing before him NOW.
And that realization reignited Bruce’s paranoia.
Once again, his logic remained consistent: "If they couldn’t be trusted, then by extension, none of us could."
The sense of betrayal he felt again must have been beyond measure.
Bruce also committed a terrible wrong—Brother Eye—but the fact that he accepted Hal back as a friend at all borders on the miraculous.
Even now, that wound likely remains with Bruce: forgiven, but never forgotten. No matter how close they may be as friends, Hal became someone Bruce cannot fully trust at a fundamental level.
Hal held onto the hope that one day his friends would trust him again.
But for Bruce alone, that trust would require giving a third chance to the man he had already forgiven once before. It must have been even harder to forgive Hal than the other friends who betrayed him.
In the original proposal for Green Lantern: Rebirth, Geoff Johns identified a MAJOR moment as “Batman apologizes to Hal Jordan."
Ironically, Johns’ cosmic bug retcon aligns perfectly with Bruce’s long-held belief: that Parallax was not the Hal they knew.
If anyone should have welcomed that retcon, it was Bruce.
But in Rebirth, that didn't happen. Batman does not apologize. He retains a degree of distrust.
And even when they reconcile as friends again in Green Lantern v4 #9 (right after Infinite Crisis), he still does not apologize—he merely accepts Hal back.
When drafting the original proposal, the fact that it originally included a plot where the cosmic bug Parallax infects Batman was certainly one reason, but I suspect the more decisive factor was that Identity Crisis hadn't been fully conceptualized at that point.
This is further supported by the fact that when Brad Meltzer first presented his writing plan for Identity Crisis to DC, he deliberately avoided mentioning the plot revealing that some members of the JLA had erased Batman’s memories, because he believed DC would not approve it if presented outright.
That makes it even more likely that Johns, when drafting the original proposal for Rebirth, simply didn’t know where Identity Crisis was ultimately headed.
Imagine the period after the Parallax retcon. Bruce comes to realize that the friend who had “betrayed EVERYONE” had, in fact, only betrayed HIM.
Hal was still good, still decent—still the best and the brightest to everyone.