It always comes down to values. There will always be people that are willing to sacrifice the few(old and the poor) in order to keep a more comfortable life for the larger majority. Others value the sanctity of life more and feel a duty of sacrifice to preserve it and of course there's a degree of fear(some rational some not about our own health). Most of it is not scientific, it's essentially a moral dilemma and most people have a slightly different view of how much sacrifice is acceptable vs how much risks there is to their lives and others.
People can argue until the end of time, there will not be a right or wrong answer to moral choices like these. I imagine democratic societies will get a chance to have their voices heard at the ballot box, others well, I guess they can go on internet forums to vent their frustrations and try to convince others they are right.