Rationalization offers a plausible-sounding justification for behavior that is actually harmful or excessive, and it works precisely because the justification is plausible — not obviously false, just incomplete. "I push my daughter hard because I want her to succeed in a competitive world" sounds like ordinary parental concern, which is exactly what makes it effective at deflecting an otherwise legitimate objection. George Simon's clinical observation is that the plausibility itself is the trap: the listener starts arguing about whether the justification is reasonable, instead of evaluating whether the underlying behavior is actually harmful.
The practical fix Simon offers is a reframe: don't debate the excuse on its merits at all. A justification, however reasonable-sounding, doesn't change whether the behavior itself is causing real harm — the two questions are separate, and manipulation specifically works by merging them into one.
Simon describes a father, Joe, who relentlessly pressured his teenage daughter to be the top academic and athletic performer in her class, framing every demand as devotion to her future success in a competitive world. His wife sensed the pressure was excessive and harmful, but each time she considered objecting, his explanation sounded reasonable enough that she talked herself out of it and began doubting her own judgment instead. It took real clinical work before she recognized that Joe's stated reasons, however plausible, were irrelevant to the actual question of whether the pressure was hurting their daughter.