The criminal is responsible for his actions, not any objects he might bump up against such as: high-velocity lead from a potential victim, bridge abutments, water under a bridge span...
If he commits his crime while cross-wise with God, that is his problem.
In a more general note, most teenagers are nitwits. It is not their fault. Truly, their brains are not finished developing and have some serious deficiencies compared to a physically matured adult. It is our job as adults to steer or cuff them on to the straight & narrow, despite their teenaged nitwittery.