I see this in discussions about 9/11 all the time, where someone will express incredulity that it would be possible for a bunch of "goat farmers" to execute such a plan. But if you actually look at those terrorists, many were educated and from well-to-do families.
Very much the same thing with the Sri Lanka attacks.
I think the American public/media likes to paint everyone from the non-West as extremely backwards, when in reality I feel like everywhere in the non-West has "West"-like pockets of extreme affluence and then just huge amounts of inequality and rural poverty.
The specific thing people fail to realize is how much oil money was feeding into terrorist groups. If you understand that, you are no longer surprised that they attracted talented (albeit thoroughly evil) people.
Of course not, but since Saudi Arabia is the ally of the USA, in the eyes of many the enemy of Saudi Arabia must be a bunch of terrorists instead of liberation fighters who want to get rid of a president that was appointed by Saudi Arabia.
None of the 9/11 terrorists were Yemeni, but if they had been then yes they're a terrorist. Hijacking a plane to kill 1000s of civilians is clearly terrorism.