I joined the army at 15 years of age. Many of my army colleagues did the same. It was a rational decision for all of us. Nobody forced us to do it. We all volunteered.
This young girl joined ISIS at 15 years of age.
I went on to join an infantry battalion at 17 years of age and subsequently served on several tours in the service of my country fighting terrorism, helping to uphold the rule of law and helping to save lives.
She associated with ruthless pityless murderers who tortured their victims before subjecting them to a defenceless violent death.
In terms of my decision to join the British Army and her decision to join a vile terrorist organisation, the two common denominators are our age and our rational willingness to make that decision.