Right after natural disasters, when there is a lapse of authority before the state can reassert its power, we get a glimpse of what the state of nature might look like: looting, rape, and violence; increasingly perpetrated by roaming gangs of armed gunmen as time passes and the state fails to regain control.
I do not think, however, that this reflects human nature. Human nature is varied, not monolithic. Not everyone becomes a marauding pillager when the rule of law breaks down. Some people display acts of courage, compassion, and self-sacrifice, and are guided by a sense of justice.
The problem is how to defend against those who are nasty and brutish, so that life doesn't turn out to be short, solitary, and poor for the rest of us.