But crucially not intent to commit treason. Gross negligence, sure (this she also admitted to). And I agree that she - and several others - ought to be punished much harder. But being naïve and incompetent (basically "yeah this is a problem but IBM can't provide people with security clearance yet, it takes too much time, and we're too far into the process and if we stop now many things - such as giving out driver's licenses and checking them - won't work for a while")... is, again, not treason.

Just like involuntary manslaughter is not murder, and so on.

Here's the definition by the way, 19 kap. 1 § brottsbalken: https://lagen.nu/1962:700#K19

Is that word from the same root as arquebus?

Yes, correct: https://sv.wikipedia.org/wiki/Arkebusering#Etymologi

Ultimately, both words come from low German "hakebusse".

for those who does not speak swedish (like me). google translate says "firing squad in the courtyard"

That was a joke though. :)

And slottsgården is more like "courtyard of the castle"

"Castle courtyard" or "palace courtyard".

Probably palace, since that's the fancier building with less physical defences in the construction.