Chang was drawn discussing with Dewey by Mad Mask, and it seemed that the UNA wasn't in control (besides how could they conquer the entire world in about a month after FFF?) and Keveak weren't even involved in the fight at this point, thus it isn't really a problem is it? (he visits a private research facility where his friend work that unknown to him in the future will be sponsored by a organisation he hadn't heard of at the time which he will come to fight in a resistance he neither don't know much about yet)
EDIT:
Or do you hold him responsible of the TJH teams actions?