'Love' did help everyone of the people quoted, those that were ill etc. The love of fellow humans, that is. Yes people do things out of selfishness, that is what most religion is, we do good things so we go to Heaven and not Hell, carrot and stick.
But the welfare state and other human right acts have been pioneered by those with a sense of 'love', for want of a better word, towards their fellow 'man' (and woman).
Animal charities are born out of people who love animals etc.
I think that the OP has a point, if you have good carers who love you,(parents, but doesn't have to be) as children, life goes alot better.
You treat someone you love with respect, the message has taken along time to get through to women that DV etc, isn't how someone who loves you treats you.
MH issues are different, of course.
We have never paid enough attention to the quality of the relationships that we develop with others, if we did, other things would right themselves.
If we question the basis of our actions, which would enhance our self awareness and force us to be honest with ourselves and others, then the world would be a much better place.