The Death Penalty

We understand the feelings of rage felt by crime victims and their families. But - studies show there is no deterrent effect to State executions. And, DNA evidence has exonerated 122 men formerly on death row! If we're killing inmates to satisfy a primitive emotion, if we can't be sure the criminal is guilty as charged, and we have ways to keep someone locked up and out of circulation for life and for less cost, why does our government still support the archaic, primitive, cruel and costly BULLSHIT known as the Death Penalty?