The primary obstacle to ending individual and collective suffering is the need to separate ourselves from others, natural order, and the source of life. If we truly are all one by nature (part of the web of life) then any sense of separation that is experienced comes from within us in the form of mental constructs: thoughts/perceptions/ideologies/beliefs/judgments. And the extreme expression of separation is violence toward self ("I don't belong") or others ("you are the enemy").
While we all have distinct physical features and personal histories, a sense of separation keeps us feeling alone, isolated and empty. DIFFERENCES ARE A GIVEN, SEPARATION IS A CHOICE.
A quote by physicist David Bohm:
"Reality is what we take to be true. What we take to be true is what we believe. What we believe is based upon our perceptions. What we perceive depends on what we look for. What we look for depends on what we think. What we think depends on what we perceive. What we perceive determines what we believe. What we believe determines what we take to be true. What we take to be true is our reality."