With no order I reason about the posible causes to assume a false identity

I suspect there are different cases :

1) false identity in the institution where he/she works and real identity in life out of institution.
I believe that this human being covers his actions inside the institution, so legal actions on his responsabilities that should affect him, couldn't be executed. If it is posible to prove false identity, this should be the first crime in the institution, I think. The institution should assume the responsability of corroborate the identity of its staff. No ?

2) false identity in the institution where he/she works and false identity in life out of institution.
I'm not lawyer, but I suspect, this is an absolute change of identity, the responsability of detect it should belong to the institutions he/she has contact.

3) false identity in same cases
The responsability of detect it should belong to the institutions he/she has contact.

As I understand, identity is a citizen duty inside a legal framework of the country he/she born and dwells. 
Am I wrong ?

Those people who has false identities , apparently they would not be reached by the legal framework of the country he/she dwells.

The countries tolerate these cases of false identities, is it not a crime not to be declare inside the legal framework of the country he/she dwells ?

If countries tolerate false identities, identities are worthless and  "There be saved the one who could", isn't it ?

Should security be built among all dwellers? Why so permissive ? Why nothing is important ?
Why this absolute, deep, staunch, lack of interest to exist ?