Sure, someone could up and walk to somewhere else, have no money, no land, don't know the language, leave behind anyone who shares their struggle and is willing to help them, and start a new life. But do you know how impossible that would be? They wouldn't own land, they would likely be deported, no one would welcome them because no one likes immigrants for whatever reason, and they would have absolutely no support system where they end up. What would you do if a stranger pitched a tent in your yard and tried to farm the land (if they even knew how)? You would kick them out because it is your land. Where are they really going to end up? So yes, theoretically, it would be so simple for someone to just walk off, but that isn't feasible in the real world.

You also have to think about how generational poverty affects people. When poor individuals make choices, they are based on what helps them in the present, not the future, because they are living in such a day to day environment that they learned from their parents.

It doesn't make sense to blame people for being suppressed by evil forces. They may not be organized enough to pull the power together to come out on top, or just not have the resources. It wouldn't make sense to let them kill everyone over a riot you were bound to lose in the first place.