A system is flawed if it takes more innocent lives than it saves.
Here are some facts.
"just over six per cent - of mandatory life-sentenced prisoners who were released between January 1 2003 and February 17 2009, were recalled and found guilty of a further offence"
If you read the details, the picture is even worse than that.
We need to compare the percentage of murderers who you believe are wrongly convicted against that 6% chance of a freed killer reoffending.
Some freed killers kill again. So how many is too many for you? How many would it take for you to admit that your system is flawed beyond acceptable tolerances?
EDIT> Just a reminder the above quote is about
mandatory life-sentenced prisoners. Arguing that keeping them in prison for life solves the problem is no use unless they are actually kept in prison for life!