I've tried to talk to younger kids in my family about building things with computers. You'd be surprised how hard it is to get them interested, even if they play Minecraft all day.
For many of us, we got interested in programming though randomly hacking a game at one point in time. Telling kids that they can build their own games or apps and helping them potentially get interested is a big deal in itself.
Most of the objections seem to boil down to this. For better or for worse, HN is an entrepreneurial community, and everyone seems to be approaching this with an ultra-logical "this policy will decrease my worth by $X" approach. Post this video on a forum that's geared toward, say, developers of open-source software and see how different the reaction is.
hard vs easy good vs bad moral vs immoral
can sometimes be over simplifying due to the normative nature of these concepts.
For someone who knows Vietnamese to learn Chinese is easy, but for someone who only knows English learning Chinese can be harder.
Each discipline has its' own linguistic domain. The difference between a software programmer and a rocket scientist is the rocket scientist knows a set of specific terms/vocabulary that distinguishes different parts of rocket, fuel, working process of aerospace and other stuff I don't know anything about. Not only does the rocket scientist knows all the terms, he/she also understands the relationship between each terms. It is mastery of this Linguistic Domain that make it possible for rocket scientists.
Programmer has mastery of a different Linguistic Domain and for some rocket scientists it may seem hard.
I do some what agree with you on the 'insecurity thing'. Although I think that is only a case in below stage 4 working culture (see Dave Logan, Tribal Leadership for reference on organizational culture stages http://www.ted.com/talks/david_logan_on_tribal_leadership.ht...).
Lately, I've realized the motivational impact of having a hero. Something to aspire to. Kids go after what you expose them to. This ties in to what pg said in his essay about "nerds", and I imagine it has a lot to do with the unevenness of the CS demographic. I think the president's video is great. Not all of us have to become CS grads. But for some, the meekest exposure can sow the seeds of a great career path or hobby.