I believe everyone can be taught to program, and the choice of language, semantics, and syntax has a profound effect on how far people can get, and what frustrations they face.
There are people out there with 0 formal training who run entire businesses on Excel, the most widely used programming language bar none (it's notable that in Excel, rows start at 1 and not 0. There is a reason for this). Ask a 7 year old to use C and they're not going to get very far. Give a 7 year old Logo, and they'll be writing programs with very little instruction, with results I've seen college freshmen struggle with.
I teach a summer robotics program to middle schoolers. We used to teach it in C++ because that's what the SDK came written in. In this mode, we spent most of the time getting them to think like the compiler, teaching them about memory layout, allocation, compiling, headers, preprocessors, etc. because they constantly ran into frustrations due to the design choices of C++. They never left the session with a firm understanding and confidence around programming because they spent all their time trying to build a model from scratch in their head without any relation to their own world.
Then we switched to Matlab. With one uniform data structure, a REPL, 1-based indexing, etc. they were much more comfortable, and they were able to make the robots do amazing things for their age. The most impressive thing I've seen is making a robot choir through writing a distributed protocol to synchronize the robots' notes. They were able to do this because the language, Matlab, got out of their way, which allowed them to focus on the task and relate it back to something they knew very well: music.
All I'm saying is this attitude of "Oh, you don't understand this thing we've built and these arbitrary limitations frustrate you, therefore you shouldn't even try it in the first place" is just toxic, given the evidence I've seen that people can learn and do amazing things if we give them a fighting chance.
Required reading on this subject: https://www.amazon.com/Mindstorms-Children-Computers-Powerfu...