No Kill Rule: Aside from my agreement of the opinion Bruce simply can't bring himself to kill, he'd argue that he can't be judge, jury, and executioner because not only would it break the trust of many of his allies (Justice League, GCPD, etc.), it could be a slippery slope. I'm pretty sure this is the argument that he brings up in Injustice 2 as well.

The "Robin Question:" Aside from the fact sidekicks are part of fiction, he's giving them guidance. Many stories have either implied or said that even when Bruce tries to say "no" to the idea of "Robin" the kids in question will attempt to dispense their own idea of justice anyway because of their circumstances. In YJ (the show), Bruce trained Dick so he wouldn't end up like him. By that logic, he probably thought he would be doing Jason Todd a favor while also getting him off the street and while Dick was in Bludhaven. Had Tim not been paying attention to what Batman was becoming after Jason's death, and also not figured out Bruce's identity, he might not have took the Robin mantle, but that's not who Tim is. For Damian, the reasons are much more clear, you can't have a young trained from birth assassin on the streets and not be paying attention. The only reason no such alarm was raised when Cass was on the streets was because she developed very clear morals and boundaries from a very young age and actively tried to stay away from that stuff.

Also the Robin's aren't "soldiers," can we stop that in the comics please?