I don't think most people on HN implying such things mean to say old people are freely expendable, but rather that they should not be saved at _all cost_. Our non-pharmaceutical interventions have a cost associated with them too, so we have to strike a balance that's acceptable. The debate to me is ultimately over where the line is. It's not helped that the true costs of lockdowns etc. (or indeed the true cost of not locking down) are not actually all that clear. One consequence is that debates over policies such as these have happened without reliable figures on both sides, and have therefore descended into unconstructive emotional arguments.