So a broken system has now made you unwillingly responsible for whatever harm your ‘brother’ does in the future.

You would have been better to have put your considerable abilities toward finding ways to ensure that when a crime is committed, the correct offender is infallibly found, expertly assessed and appropriately sentenced (including where necessary -and is sometimes is- euthanasia). Instead you sympathised with the proven guilty and have become potentially guilty of any future offences he commits. You should have known better.