This kind of heightened social symbiosis intrinsic in migrant illegality is distinct from, say, the refuge afforded a fugitive murder convict by relatives, or the solace given to a terminally-ill patient by social workers: in the former case, familial obligation prevails over attributed high risk; in the latter case, the imperative may be fueled by altruism. In migrant illegality, the interdependence is inherently vested and voluntary: employers secure business flexibility thru exceptionally-compliant overstayer hirees; ethnic pockets who help overstayers get rights to collect future favors, loyalty, reciprocated intimacy, etc.; cooperative local authorities get convenience, a robust, resilient and low-cost small-business sector, possibly even benefits to multiculturalism; finally, overstayers get continued existence.
Interdependence exhibits itself in employer protection (recall Etimo and Gandi/Textbox 3) or utilitarianism and convenience (recall Putik/Textbox 4).