#dUkE iS nOrmaL....no just no as a child he accepted The Riddlers challenge to try and beat him. he did riddes for fun. he also figured out-

[batcavescolony]

The fandom would be so much better if everyone realized that Batman's kids are just like that. None of them are normal! This is what they were doing before/directly after meeting Bruce:

Dick wanted to kill Anthony Zucco and avenge he parents death.

Jason uncovered a crime front in the troubled youth school he was sent to.

Tim stalked Batman, Nightwing AND the Teen Titans.

Stephanie created a whole vigilante persona to mess with her dad.

Damian and Cass are trained assassin children that can get anywhere.

Duke joined and lead the 'we are Robin movement' along with being a vigilante before he was Signal.

Bruce doesn't control them, he has tried to stop them, they don't listen. They aren't vigilantes because Bruce forced them to, I'm pretty sure they would have done that without his help, they're chaos incarnate!