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As for how those early zombie apocolypes started...

Nobody knew what the fuck a zombie was. People just saw these weird looking drunk guys... and got bit that way.

After that it was a pack mentality type thing.

Or at least that was how Night of the Living dead worked.

Suddenly there were these murderous cannibals all over the place. With so many... eventually a giant mob is going to be too much to push away. 

 

They stopped being a problem once the army and really even just people with guns figured out what zombies were and how to deal with them.