Cage isn't angry for no reason.Cage anger is justifiable in the context of his comic origin. As long as you explain why the character feels the way he does and acts the way he does audiences will go with it.
Cage is a character that some people always seem to project their own prejudices and racial opinions onto drastically changing his origin won't change those type of peoples views.
Having cage join a terrorist group will not endear him to an audience. Atleast in his comic origin he is only risking his own life by undergoing the experiment. By having AIM be involved he is aiding them in their
endeavours by being involved.
Cage is a superhero Blaxploitation character.