The concept of 'do as you would be done by' has been around for much longer than the Charles Kingsley 'Water Babies' story. There's an Egyptian fable which concludes: "That which you hate to be done to you, do not do to others." The ancient Greek Epictetus said: "What thou avoidest suffering thyself, seek not to impose on others." The converse is Kingsley's 'Mrs Be-Done-By-As-You-Did' who taught the golden rule of civilisation: if you don't or wouldn't like it yourself, then best not do it to someone else.
During conflicts around the world, in many different cultural settings, we know that people have stood up against injustice at great cost to not only themselves, but also their communities. Surely, as individuals and as a caring society, we have a moral duty to supply aid at the time and place of need. The world is changing at a great pace, is it getting to be an uncomfortable place for us in the west now that our comforts are possibly being encroached upon by others? Maybe it's time to share a little more with those who, through an accident of birth, have not had the advantages we take for granted here in the UK.
The argument about housing our own homeless population is for another thread, but maybe just ponder the fact that in this country, according to the government's own figures the number of empty homes in England in October 2017 stood at 605,891. Of these, 205,293 were classed as long-term empty properties (empty for longer than six months).