Unforgivable Problems With Core Plot

Rating: 3/10 (27 March 2019)

The whole revenge plot the movie is built upon collapses in on itself when you read the story according to what the writers give you.
For example: the writers tell us through monologue that the clones are built to mimic the behavior of those above ground, but at the same time, the writers give them displays of freewill and personal desires. Which is not a problem on it's own; minor inconsistencies are required to form any interesting narrative. But when the protagonist, a little girl aware that she's mimicking another walks up the stairs, opens the door and is suddenly in the real world; acting with freewill, forces the other child underground as some kind of illogical vengeful desire, it creates questions and problems that were never addressed.
1. If the "shadows" exhibit freewill and a sense of curiosity and passion, why haven't any of the "shadows" wondered what was up a completely visible gilded staircase?
2. Why didn't the child, once kidnapped simply walk back up the staircase and into the free world to the saftey of her parents? Is that not what a child would desire? Not a nationwide takeover consisting of a genocide, but simply to get back to saftey?
Another thing to consider is the the child from the underground's fear of beaches and exhibitions of panic attacks. Why would she fear the beach? Why have panic attacks about seeing the other child when she knew full well about tethering as she's stated in her over-explanatory monologue... These scenes purely exist at the expense of the core plot and to add tension where the director could't find other ways to increase it.
The movie's message is blurred given these incredibly blatant plot holes as well. Classism is what most consider to be the prime theme in "US", But if anybody can ascend from living underground, eating raw rabbits to living above ground on a sunny beach simply by taking an escalator, is that really a case of classism? Is this a critique of critiques about classism in america shown through plot holes in a story? The answer won't ever be found organically unfortunately.