Sounds about right. Although some number of those could be classified as plane interface errors or process deficiencies, nobody is perfect. Beyond that, in those situations, nobody was deliberately trying to get them to crash the plane!
In the years I worked as a nightclub bouncer, dozens or hundreds of people would try to fool me every night... and sometimes they did! I had a lot of experience foiling them, but they had a lot more time on their hands to scheme whatever thing they were scheming than I had to pay attention to them, individually.
As people pointed out, this was a technically simple attack-- the meat of the attack was psychological and emotional. In practice, particularly smart people are more susceptible to attacks like this because they subconsciously assume they'll catch everything that comes at them, and make a lot of assumptions about the attack vectors of problems based on what they're good at, like the classic XKCD about cryptography vs a wrench.
In the years I worked as a nightclub bouncer, dozens or hundreds of people would try to fool me every night... and sometimes they did! I had a lot of experience foiling them, but they had a lot more time on their hands to scheme whatever thing they were scheming than I had to pay attention to them, individually.
As people pointed out, this was a technically simple attack-- the meat of the attack was psychological and emotional. In practice, particularly smart people are more susceptible to attacks like this because they subconsciously assume they'll catch everything that comes at them, and make a lot of assumptions about the attack vectors of problems based on what they're good at, like the classic XKCD about cryptography vs a wrench.