Perhaps because most humans are apparently more motivated by fear and greed rather than polite charitable requests
Maybe many humans are motivated by fear, but what I've seen so far isn't too scary. It's interesting to observe how many of those who contact me obviously have made up some kind of weird story.
The corporate lawyer who claimed a parking page was a phishing scam and this ccTLD registry which claims to have conducted an investigation proving that I do not exist are both somwhere at the top of my list of mediocre fiction writers.