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Deleterious or dangerous? (ie, does it hurt the supercap, or the thing shorting the supercap)?

"When first I appear, I seem deleterious / But when explained, I'm nothing serious"

Dangerous. Hurts the thing shorting the supercap and anything in close proximity to that thing

wow, it sounds like it would make Samsung's Note 7 battery problems seem elementary. Who would want to carry a device like that in their back pocket or hand it to kids to play with? Would a good drop on hard pavement or sheet metal cause this thing to go off?

It's not particularly easier to physically rupture than a normal battery. You would have to smash it hard enough to break apart the device.

Probably both. The fraction of energy deposited in each depends on how the internal resistance of the cap compares to that of the load.

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