Well, even that's a bit of a retcon, isn't it? After a few issues, Bruce didn't really have the problem (except victim-blaming Jason, which I think began when we were still in Death in the Family or immediately thereafter) until they decided they needed a new Robin and then the super-violent was brought in just to give Tim a purpose to seek him out. Or so it sometimes seems. And with Tim "saving" him - Bruce didn't learn anything - the entire mantra was "it was all Jason's fault and you did nothing wrong." I guess that's what Bruce learned. So Tim, who's obviously superior to Jason, is fine to have as Robin, since he won't screw up and get himself killed.