Zombie apocalypse.
It is well and truly upon us. For the moment, we feed them enough just to sustain. Heck, some of the more motivated zombies are already declaring that they should "eat the rich." Just wait until that social safety net fails. You'll have tribes of zombie takers roaming the country consuming everything in their path and leaving nothing in their wake. Sure, it'll begin in the large population centers where these zombies tend to populate anyway. They will then quickly run out of resources in those places and move on to suburbs and eventually the countryside. What they fail to understand is that they have their medicaid, SNAP and SSI to protect us from them and their steady hunger for the wealth of others. It's a slow boiling pot that will eventually overflow.