Risk of assault at the border

Article: https://sites.ecu.edu/genderpoliticsculture/wp-admin/post-new.php

Overview: Every year many migrants will attempt to cross the Mexico-American border coming from Mexico, El Salvador, and Guatemala etc. Many face the risk of sexual assault and rape because they are out numbered by men on the journey. Many take this journey because of fear of violence back home. Many women do not report these cases because of fear of deportation.

Questions: Why does this violence against women at the border go unnoticed? Why is this not a bigger recognized issue ?