How are people still so naive? When a teenager posts something they later regret to facebook, I can rationalize it as the folly of youth and not thinking about

How are people still so naive? When a teenager posts something they later regret to facebook, I can rationalize it as the folly of youth and not thinking about the consequences of their actions. But someone hired by Cisco, using a service explicitly for publicly broadcasting a message? There is no excuse for why they don't know better.