My personal opinion is the parkland shooter should be put down. Given the system we have in place that means year upon years of expensive to tax payer appeals before the sentence is executed. That also allows the appeals to end up reducing the time in prison depending on judges who are also "liberal activists". Why this guy got life without parole, I do not know. I assume since the families are upset that there was a death penalty option but do not know the instructions given to the jurors.
For me, I have found that true evil does exist in this world and the only way to conclusively protect the society from an identified evil person such as this shooter is to remove him from existence. There is a 100% chance that he will not re-offend or endanger anyone in that case. Every other sentence option cannot maintain the same claim. When in custody, escape is always a possibility, as is sentence reduction / parole / pardon even for life without parole. Governors and presidents do stupid things at times at the end of their term.