We are talking about two different things here. Secure retention and secure deletion.
Clinton was very cavalier about secure retention.
She was apparently very serious about secure deletion.
And her argument is that the things retained with poor security were those of state, while those deleted with apparently deliberate security were personal.
One could easily thus infer that she wasn't particularly concerned about protecting the secrets of state, but was very concerned about ensuring that her own secrets never saw the light of day. Whether or not that's the case is another matter, but you're conflating a whole several things together here that are in fact conceptually separate—retention, deletion, national, personal.
The significance of this is Elon Musk, who is the self-driving Uber of dot.com billionaires and is the hero of our times.
Well, I knew Steve Jobs well enough, and have met a few civilian astronauts and a bunch of other rich people. None of the others seem to have done so much for the long-term future of the human race as Musk has in leading the path to more affordable spaceflight.
Well, it beats making them into the world's most complicated airplanes as with the space shuttle. SpaceX has proven that they can do vertical landings of the first stage intact onto both land and a seagoing barge; after a trip out of the atmosphere and to about 1/5 of orbital velocity but not into orbit. They plan to do a parachute-less vertical landing of the Dragon capsule after a heat-shield re-entry. That turns out to be far less expensive and complicated than a space plane. It does turn out we need a lifting body for much larger vehicles. It still doesn't have to be a plane, though.
We don't need wings.
When you release something into the world, you should really understand people.
You should, but "some idiot might try to change batteries while driving" is not a kind of thing you can reasonably protect against.
More generally, at some point safety features will actually make things less safe. For example, forklifts have to sound alarm while backing. Good idea if there were always just one, but if you have many of them working in the same warehouse the resulting cacophony masks other sounds - such as the tire noise of the forklift that's about to drive over you.