/2/ Kerry helped influence Congress to cut off all military resupply to the RVN. Without bullets or fuel, the RVN was unable to defend itself, and the NVA rolled into Saigon in a conventional armored thrust.
You can thank Kerry and his commie loving pals for millions imprisoned in "reeduation camps" and dead in the killing fields. Yes, he helped to drive the US out of SE Asia. And he must take a large chunk of responsiblity for the horrors that followed.