All of society comes out of having values and principles. Sure there are disagreements on what those should be. Of the ones generally agreed upon there are people who will try to take advantage of others that follow them or disregard the principles outright.
We tend to take for granted that most people agree that killing each other is bad. But people agree to that principle to such an extent that we generally feel safe enough to leave our shelters and be among public spaces. If so many people did not hold that value, we would be expending significantly more effort to secure ourselves. We would need to put so much effort into that, that we probably would not have had the opportunity for as much technology or innovation.
In that vein, we can shift and change the way human society is structured and grown through the influence of people's values. So it makes sense to live the values you wish to see reflected in the world.
At the end of the day, nothing really matters. Because nothing matters, we can decide what we feel is important about living for ourselves and do it.