Coming from a social democracy I think the main difference in viewpoint is that the downward spiral has to stop somewhere because otherwise the damage not just to a person but to society can be too great - e.g. see communist revolutions. Letting whole families go bankrupt because of a medical issue is counterproductive even just using capitalistic values. Long term you want people to be prosperous enough to buy your stuff and educated enough to create value. Too many pressures towards negative social mobility is therefore a net loss for society. Thus you can simply regard social health care and social services as an investment towards future growth.