Hobbes isn't exactly subtle about it in 'Leviathan'. The whole thing basically screams that humans, left to our own devices, are a bunch of selfish jerks who'd be in a constant, brutal war against each other forever. Life would be 'solitary, poor, nasty, brutish, and short'—you know, the famous quote.
His solution is this absolute, unquestionable power, the Leviathan (the state), that we all agree to hand over our rights to. It's a social contract, but not the nice kind where we all vote on stuff. It's more like we trade our freedom to kill each other for the promise of not being killed. He argues that any strong government, even a monarchy he seems to prefer, is better than the chaos of no government at all. The argument really comes from a place of deep, almost paranoid pessimism about human nature.
Reading it now, it feels shockingly bleak but also weirdly logical, like staring into a cold, hard mirror of what society could be without any rules at all.