Never too much logic haha
IMO, Psychological ability of not giving a crap was probably determined by bio-psycho-social influences and genes, but I think that it is possible to"train" ourselves not to give a crap but even having ability to consider such training has been also determined by our genetic-biological and environmental influences\experiences. In the end there is no such thing as free will. In my case, my loneliness is direct product of my unsustainable, negligence and abusive experiences in childhood. For a while I thought that it was my choice due to my character until I realised that it is just projection of many anxieties and some psychological disorders.
https://youtu.be/_FanhvXO9Pk

(btw is your chat working? I have been getting bad gateway since yesterday evening)