There should be no political executions. And even in civil cases, executions should only apply in a minority of cases, of first degree murder. As far as I know, these very young men are at worst guilty of :
( 1 ) Armed robbery with a pistol, with no deaths or injury.
( 2 ) Possibly arson , taking photographs of incident , with no reported deaths or injury.
( 3 ) Possibly possession of pistol , in demonstrations, with no proven deaths or injury.
( 4 ) Possible verbal support for terror MKO, who support causing deaths or injury.
Since none of these crimes has led to proven loss of life. Then punishment should fall short of death penalty. However the penalty, should be similar to those who indirectly support or facilitate murder, in civil cases. Such as paying a hitman to do a killing. The hitman deserves death sentence. The paymaster a long prison term.
In this case, a long prison term, that enables them to compensate the victim of robbery and any damage to property in fires, by prison work. Should be enough. If damage to property was not high, and they have compensated by work in prison. Then one reason for release, at that time.
Their support for any illegal group. Should be addressed by political education in prison. If they repent, then another reason for release at that time. If possible their sentence should not be so long, as to stop them at future date from marrying and having a family.