Well her detention didn't happen immediately, it likely happened because she didn't respond to an email while they were investigating asking for more information, which she even admits.
* All this story does it makes me want to avoid traveling to Japan. I don't fancy getting picked up for jay walking and tortured.*
Sure if you naively believe the hyperbole then don't go. Been 3 times, you'll know when you're in trouble, and you will have a chance to correct it before it goes further.
Infact according to her video she did have a chance, and she didn't bother.