I am the writer/director of the film. And, no, I'm not a Dreamer. But I did come here undocumented and a lot of my family and friends are undocumented. I can understand your frustration but, in this case, it's unnecessary.
How did he start working in his field? He used a false social security number. And only when the "No match" letter from SSA comes in does his employer discover his status.
I suggest you fight the enemy and not your allies.