I must agree that eradicating any group, regardless of its goals, is impossible. However, I do not believe that the world is without hope. Other groups can develop to fight these "powerful entities," to slow them down or bring relief to those that they harm.
As an example, there is a non-profit organization out of New York City called the We Are Family Foundation. This organization supports a group of young people in a program called "Three Dot Dash" (...—), named for the morse code for the letter "V," the symbol we make with our fingers that represents peace. "Inspired by the late 13-year-old poet and peacemaker Mattie J.T. Stepanek," young people find ways to help the world where they live. For instance, one young man found that in his embattled country, civilians were dying of infections from small wounds brought on by the fighting that was destroying their towns and villages. This young man learned first-aid. He contacted groups willing to donate first-aid supplies. Then he called on young people from neighboring areas to visit him; he taught them first-aid and gave them a first-aid kit. They returned to their homes and the word (and help) spread. This is just one example.
This young man and many like him are changing the world with WAFF, in 29 countries, on 7 continents. This is certainly not the only group out there, but it is an example of how anyone—at any age—finding the world to be in great need, can gather with others of like mind and decide to "make a change."
Your concern in commendable. Don't lose hope. Find a need and join with others willing to step up and change the world, one problem—and one place—at a time. In this way, we can "fight back" without raising arms against others. And remember to return all actions toward you with forgiveness and tolerance. It is hard to do. But if we do not, we foster the behavior of these other groups and become like them. Peace and love are stronger than hatred.
I wish you well in finding a path that helps you change your world.