For what purpose were his fellow Marines fighting?
Did he really turn 'traitor', i.e.: turn against his country? Or, did he fight against a bunch of mercenaries wearing the uniforms of US Marines?
Opponents to the movie seem to be of two classes:
Those who haven’t seen the movie, but read up on negative articles about it, then spew the results as if it were their original idea.
Those who went to the movie, prepped toward the negative bias, and who then conveniently ignored some of the facts.
Fact: The CO of the Mercks ‘asked’ the Jyrene to keep him informed.
Fact: The ‘hero’ of the story was being paid to be a ‘corporate spy’, not a ‘soldier’.