Except so what? Because Bruce succeeded in his goal of keeping Cass his perfect weapon and Babs' wasn't able to teach Cass how to read, Bruce is the better parent? And except Babs' adopted Charlie?
So because he had good intentions, that makes it okay? Bruce wanted Cass to say his little weapon forever. Babs' wanted Cass to grow and be able to make informed choices and have a life beyond Batgirl.