Art is defined as the expression or application of human creative skill and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power.
When it comes to art it's simplistic manner of getting straight to the root of an issue is uncanny. Art is as powerful as you make it, art has the highest value when it not only identifies with but also resonates with its viewers. While all individuals can resonate with art, not all art can resonate with individuals.
When you believe in hard facts about a specific issue any artwork that expresses that belief, the artwork is magnified ten-folds, this is the because of the fact that the person viewing the artwork has that more of an emotional connection and attachment to the piece, regardless of if the person is aware of their belief or not.
Art is a peaceful way to protest, one which allows a continuous, subtle resistance, one that sits as a daily reminder of the issue. It burns into the minds of its viewers and unknowingly drives emotional responses towards micro-aggression's on the issue matter, and allows its viewers to have the courage to stand up for their beliefs.
An example of this can be seen with the "Black Lives Matter" protest that occurred on campus before the 2016 Presidential election, conducted by concerned students on Union's campus who wanted to show it's campus where they stood on the matter and what they hoped the outcome of the election results would be.