For your experience to be a happy one, the experience is not primarily reliant on what is being experienced being something which brings happiness to you, it is the you, which is experiencing, that needs to be of happiness.

So, although the outer world affects the inner being and a better world will improve the inner experience for many and is therefore a just cause, the search for a life of personal happiness is primarily about the situation within you and not the situation around you. - PunkMonk