Lack of rationale is Insurgent's biggest problem.
Damien Chazelle deserves all the credit in the world for turning what could have been an otherwise boring plot into an intense ride that felt more like a thriller than a drama.
If you want to see another teen book adaptation like Hunger games, or if you just want to be entertained by another post-war civilization story, then check out Divergent.
If you love watching raunchy humor, or just watching dirty comedies then you might like this film.