Sadly, the 'vengeance' reaction (perfectly understandable in the circumstances) will naturally make people want to tear these men to pieces. Death penalties, while to a small extent satisfying one's outrage, do nothing to try and examine and learn from the crime. I fear that is too advanced an approach for our times. I personally feel murderous towards eg paedophiles, but understanding what causes this behaviour is far more constructive in the long run.