What happens when illegal migrants realize they are being deported?

Based on Todd Bensman's account, deportation flights can become chaotic when migrants realize they're being sent back to their home countries. Specifically with Haitian migrants, they became unruly upon discovering their return destination. The deportation process appears to create a deterrent effect, as people are 'lined up to be sent back home' with the realization that 'it's not worth the trip anymore.' This suggests that consistent deportation policies may reduce illegal immigration attempts by demonstrating real consequences.