The food is really what will do it. As soon as people are hungry all bets are off. And unlike in the 70s/80s/90s, it's not just people with hunting rifles and shit anymore, it's everything from body armor to radios to night vision. Not to mention medical kit. How many people in past decades had access to chest seals, bullet sponges, high quality speed tourniquets etc on their gear? Then you've also got drones and other gadgets to boot. People are kitted up like never before.