Friedrich started an experiment to find out the importance of love and the impact of love withdrawal.
He let take 20 babies away from their mothers immediately after the birth.
He put them in a separated room with no contact to the world, and their nurses giving them no sign of love or the feeling thereof.
They only fed and quenched them.
After a few weeks of such treatment they died a brutal death of love withdrawal.
That experiment shows us how most important love is.
And maybe also the example of concentration camps or solitary confinement shows us, that the love between the inmates was/is more powerful, than the mal/nourishement at the end of the death camp/solitary confinement.