^There was a certain character logic to it, though. He'd grown up in a prison that tortured its prisoners with the illusion of hope (a clear path to escape if only they could make the climb/leap) in order to intensify their despair. And like most victims of abuse who become abusers, he imitated his abusers' patterns, playing the same kind of mind games -- giving both Bruce and Gotham a sliver of hope before destroying them both. True, if you think about it, it does fall afoul of the standard "Why don't you just shoot him?" problem, but at least there was a character-based reason for his folly, and that makes it somewhat more acceptable.
I think that myth was disproved with Professor David Skuse' study