I wouldn't shed a tear if they died due to their own stupidity in prison, but the death penalty is not an option for murderers under age 18. The Supremes have already spoken on that issue.
Until we get a real president who replaces the aging liberal judicial activists on the Court with Justices who read the Constitution, your far more appropriate choice is not an option.
You said...and I said nothing about the law. It's NOT the only moral option.