Indonesian culture (particularly Javanese) is very non-confrontational. The unwritten rules are: never admit fault; never accuse anyone else of being at fault. NEVER!
People are killed for accusing others of having done something wrong when their guilt is self-evident.
The assistance from the security guys to pick up the charts without once questioning his condition is a very good example of this trait.
The next step then is normally a completely unbelievable explanation to account for the transgression and that explanation is then accepted by all.
And please don't infer that these are racist comments - this is taught at cultural awareness classes.
And it is a cultural trait that is evident to a greater or lesser extent right through SE and eastern Asia.
It would have taken big balls, a lot of training to counter their upbringing and a strong and clear management ethos for those security guys to have intercepted the pilot.