The core issue will always be a failure to realize true identity. The belief of people that they are separate from what they perceive is alienation from what is, so of course, they will not act in their best interests. They will, at some deep level, know they really don't know, and at that level, live in chronic fear.
F-E-A-R: False Evidence-Appearing-Real.
They fear they will come to want, and this is the petri dish of greed. They fear that others will take what they have or want, and this is the spawn of hate. There are not too many people on this planet. There are too many fearful people on this planet, acting out their fears. We simply need to cull our ignorance and false notions of who and what we are. Conditional love is fear based. Having said that, in not love the answer? Conditional love is something other than love. It's a deal we propose, a corruption.
There is only one being we get to work on. We need to mind our own business. We need to do it now. Don't tell me about the future, about the past, about fear.