Oppression is "unjust or cruel exercise of authority or power."
Hope is "to expect with confidence."
From the Merriam-Webster Dictionary
Long before my memory begins, my parents taught me the principle to "love your neighbor as yourself" (Matthew 19:19 NIV). And "love is patient, love is kind... It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres" (1 Corinthians 13:4-7 NIV).
Certainly this is quite different from oppression! In walking through that tunnel, I saw not only the horror that so many go through, but also the love poured out by those trying to help the oppressed. The tunnel of hope further showed how we can love our neighbors, and take action against that which is wrong. There are plenty of people out in the world who want to help. Can you imagine the kind of change which occurs when they group together?
I myself am an advocate for people with chronic illness. One of my blogs gives thoughts on dealing with the emotional anguish caused by pain of any sort, mental or physical (http://roomfullofideas.com/b-blog). The other one is a dedicated health blog which gives advice for living a full life with chronic illness and how everyone can get healthier (http://roomfullofideas.com/h-blog).
Whatever fuels you to do the right thing, know that "hope does not put us to shame" (from Romans 5:5 NIV). Inevitably, when a cause reaches critical mass, good will occur.