Actually it's a fantastic analogy.

The articles on this issue all state that the girl didn't threaten anyone with the scissors.

It's highly probably that the teacher's missing object which initiated this mass search of everyone's bags pissed of the teacher enough that (s)he wanted to punish someone, so the girl with the scissors was an easy target, even though she had done nothing and threatened nobody with her "weapon." So the pissed off teacher gets to go on a little power trip in front of her students by calling in the administrators/cops using "rules" as an excuse. Then the administrators decided to continue making an example of this girl using the "rules" and "law" as an excuse.

Then the cop decides to arrest the girl, as opposed to deciding there was no arrestable offense or just taking her to her mother or in for "questioning" sans arrest and handcuffs.

The teacher, administrator, and cop are all responsible for this incident. I'm sick of hearing "I was just following orders/rules" from people who use it as an excuse to go on a power trip at the expense of an innocent victim.