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False. Today, the majority of the population (I would estimate ~90%) are "good" people. The reason for this is because of the social structure & law enforcement. They have little reason to steal or otherwise break the law, & the penalty for doing so is far greater than the benefit (in most circumstances).
In a post-apocalyptic setting, where society has broken down & the only law is what you make for yourself, "criminal" behavior would rapidly become the norm.
No. Every commmunity would make their own law. Every community of survivors would band tiogether closely. Liklely, laws wuld be enacted much stricter than before. Where stealing in times of prosperity isn't such a grave crime, under these circumstances, they'd be back to chopping off hands fairly soon. Also, society might become more authoritarian and certainly more xenophobic within these survivor communities.
But presuming the only things that keeps people from going psycho crazy and eating each other is rule of law and federal police is nonsense.
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If you shut off food shipments to a large city, within 2 days, shelves would be noticeably depleted. Within 4 days, rioting would likely start. Within 1-2 weeks, nearly the entire population would be ripping each other apart for food. Survival is always first, & even the most upright citizen will rapidly become "criminal" if there was no other option (as would be the case without a coherent society).
Depends on the locale really. New Orleans is much different from Smallville. In case of some sort of global apocalypse, however, while the cities will turn into hell (unless everyone dies there), the countryside would just splinter into tiny communities.
And for the record, viking-like roving bands of post-apoc madmen don't work. If only bbecause they would need loads of gas and ammo they just won't get from anywhere.