It's interesting that he says this:

"Pedophiles, terrorists, serial rapists, and murderers, for example, need to remain behind bars"

It's an easy list to write. It sounds obvious.

Yet murderers as a group is one of the groups least likely to reoffend on release, with reoffending rates in most countries in the low single digits. If you exclude certain groups of murderers (e.g. someone with organised crime / gang backgrounds), the reoffending rate drops close to zero.

Murderers are a great demonstration of how the system is politicised and focused on retribution and vengeance, rather than protection and rehabilitation: You could release almost all of them, and society would be no worse off.