Yes, sure, that's the prevailing opinion probably since even before WW2 had ended. Though without attacking neighbours, the scale of Holocaust would be greatly

Yes, sure, that's the prevailing opinion probably since even before WW2 had ended. Though without attacking neighbours, the scale of Holocaust would be greatly limited, since just a small fraction of all the killed people lived within the borders of pre-war Germany. If we look at all the (many!) genocides of 20th century, it's clear that the world is not going to respond with military intervention as long as you're executing your own 'undesirables' and not attacking your neighbours.