To ignore something on the basis that it won't effect you, is the definition of ignorance. Ignorance does not mean rude, or hateful. Ignorance means you are ignoring it.
Imagine the world is one giant lake. Every action causes a ripple. Sometimes the action is just a bubble floating to the top, and then it pops. The ripples are small and seem almost invisble by the time the reach out, but they are still moving, and the vibations cover the entire lake, as tiny particles move until acted upon by an outside force. In contrast, sometimes a rock falls in the water. Depending on the size of the rock, the ripples are much larger, and stay visible, even after moving out far from where the action took place.
Our actions will always effect others, and likewise, others actions effect us. To ignore a cause based on the understanding that "It's not my problem" or "It doesn't concern me" is a choice from a mistaken outlook. You may not understand that maybe that cause involves a cause not related to your nationality, orientation, race, gender, or even species, but it will effect you, and everything around you.
How can you stand idely by while an injustice is happening, because it doesn't concern you? What makes you superior that you have put yourself above us. Or yet, what has pushed you down, so that you feel like the cause is bigger than you? Who has scared your voice into submission? They are your equal.
However someone has trained or educated you, they may have drawn the lines for you. They've divided you from "groups" in the world by drawing battles lines. Now while there are noticeable differences that the lines are traced over, it doesn't mean that there are different rules in each territory. Those are your brothers and sisters across the border. They see and observe with eyes. They hear and listen with ears. They eat and taste with a mouth. They feel with hands and a heart.
It is your job as a human being that when you see a ripple headed in the wrong direction you need to act upon it.
This isn't a call to action. This message has been told before generations before me, and generations to come. This is a reminder, that while it may seem easier to stay around those like you, because they look the same, or they have the same social status as you, it will be easier to laugh, cry, and relate with those who have the same heart as you.
*Inspired by "A Wake" by Macklemore