Every model overlooks real aspects of the question. The person who runs the model makes the decisions, based on his/her opinion on whether an aspect is relevant.
No model is an accurate representation of the reality that it is supposed to model. It is partial, and an approximation.
Idiots disguised as scientists run their model, get some results, and then proclaim “eureka! see? it proves what I wanted to prove!”
The person who runs the model gets the answer his paymaster wants.
While they are sitting in front of their computers pretending they are gods, that weather report that said it was going to be a sunny day instead is raining cats and dogs. The god never notices and plugs in another opinion of theirs and emails Al Gore and the other frauds.