And then, when you die, become An Example. A suit in the Batcave, there as a warning. Don't Question Batman. Because then you will meet a tragic end at the end of a psychotic supervillain. But it's okay. You get to live on forever as an example of what not to do for future Robins.
It's a funny thing, that inner voice. It tends to get you killed.
See? That right there is why Bruce just has the wrong idea about handling these things. You throw them in Arkham or Blackgate, they're just going to get back out. Shoot them in the head, boom. Gone. No one's problem anymore.