There is a spiritual law that everything is connected. All people are connected at a spiritual level, and all events are related to each other. To help others is to help oneself. To harm others, it to harm oneself. And that always means doing what is beneficial. What is beneficial is not always what people or a society wants\expects. To face down, and neutralize all resistance to the inevitable flow of never-ending constant change, is to provide things of benefit can take great effort and sacrifice, and nearly always is much easier said than done. The only things that do not change are the universal laws that govern how the universe operates.
Generally good or bad is never done by just one person, but as have seen throughout history, one person can be a source of great influence on people, for good or bad. Martin Luther King convinced millions of Black Americans and White Americans that the Peaceful Warrior was the most direct way to personal liberation for all mankind, not just black Americans, and that movement saved the US from a massive racial civil war between Blacks vs Whites (see centuries of middle easy history as an example). The easy route would have been the black militant approach, where death and destruction would have been their approach; an approach that has no end and no success. Historically great leaders that convinced enough people to do the right thing, including many sacrificing themself for the greater good.
On the other hand, we can take The Donald Trump movement, which feeds on a narrow scope of hate and selfishness. Trump is the premiere icon of the moment because everything he says and does is 110% about himself and what will make him richer and more powerful. What it costs to others or to our society is irrelevant to him, and is simply beyond his ability to comprehend. To his base he represents a zero-sum game about everything, therefore the only objective is: Take everything, leave nothing. Destroy everything the other side values because what they value has no worth other than what can be taken from them. If Donald Trump was 100% successful, 100% of the time, ultimately he would start turning on the outer parameters of his own base, and start destroying his most faithful followers to take away from them all that they have, because it's always a zero-sum game with everybody, not just perceived enemies. The elimination of his own base and allies would continue until Donald Trump consumes his own inner circle and ultimately his family, leaving him all alone in the world with everything belonging to him. That is how zero-sum process would work in theory, but is a flawed dead-end theory because he can't live forever, thus he and his fake empire will crumble into dust, and that very likely will happen over the course of the next decade.