Re: Oh, OK that's fine
You seem surprised by this. Consider that social engineering works very well because people can be manipulated. Not all of us but enough to make it worth someone's time and effort. 419 scams ring a bell for starters? They're still going strong even after all these years.
PT Barnum said to the effect that there's a sucker born every minute. But given the way the population is/has exploded over the past several decades.. and idiots tend to breed idiots, and the education systems don't teach things like how not to be a sucker... well, what Barnum said is wrong. More like 10,000 born every minute.