Thanks, I couldn't see anywhere.
A few points on sentencing; offenders only serving half their sentence is actually a good thing for two main reasons. Firstly because it incentivizes good behaviour in prison, making people much easier to manage. Time off for good behaviour. Secondly someone coming out with a few years still on their sentence means they are properly supervised in the community and can be recalled to prison for much lesser behaviour. A life sentence would have been better because the supervision and recall is for life.
13 and 16 years are long sentences. No sentence would be a true reflection of what harm they have done. I'm against the death penalty and so custodial sentences are what remains. These offenders are 18 and 19, which means their sentences are proportionally most of their life. That's a long time. It's not true natural 'justice' because nothing could be.
As for having a 'rough time' inside... people say this and don't consider the implications. State sanctioned torture, rape, what are you hoping for? You want people residing at her majesty's pleasure to be beaten and hurt? No civilized country should allow that. The punishment is loss of liberty. Not physical harm. That would be barbaric and we aren't barbaric.
13 years ago my life was completely different. I moved country, married, had a child, had holidays and celebrations with family and friends, got a dog, moved jobs, volunteered, had fun and loved my life. All of that will be denied to these men. That's the punishment.