Uh yeah.
If the criminal took so many innocent lives why should they live, sleep, and eat? Is that really justice for the victims? Oh yeah. The criminal who brutally killed his or her victims gets to spend their entire life in prison alive with no suffering unless you call no freedom "suffering" when the victim did alive.
And i really don't want serial killers, serial rapists and just evil people released upon the world or back into society. You can strip their freedom but you can't extract their nature once they're back out again. If they take delight in doing evil then there's no point attempting to release them. They can be labeled "mentally ill" many times but they were in control whether to do evil or not.