I think the purpose of this life is not to "save the world" but to change yourself. The world will always be with us. We won't always be with the world. Now is our time to refine. You don't necessarily do that by running away from the world, but you don't accept its or anyone else's definition of who you really are.
More violence has been perpetrated down through history due to the attempt of various persons to impose their ideas of the perfect world upon others. Peace for 10000 years, economic equality, inquisitions, social engineering, etc.
These never work because the fundamental need for humankind (beyond food, shelter and clothing) is freedom (that inner freedom to define the uniqueness of yourself as an image of the Divine which is Uniqueness Personified).
As that old songwriter William Blake said, "I must create my own system or be enslaved by another man's."