How is shooting people an effective and responsible reaction? Once you start shooting, you’d have to keep going until everyone was dead. It might be comforting for you to classify some humans as ‘monsters’ but it’s not accurate or useful.

I realise you have very strong feelings about this subject, but it seems like your emotions are clouding your judgement. Most people are capable of inflicting the type of cruelty subjected to those poor souls in the death camps — if you think you’re not, then it’s highly likely you’ll be the person to inflict the cruelty next time, which is supported by the evidence of your desire to shoot other people and classify them as monsters.