education (6) Dolphin disco

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John: Take a look. https://en.wikipedia.org/wiki/List_of_school_massacres_by_death_toll . It's a list of Campus Killing. However, it's just a tip of the iceberg.
Me ( stunned ): Jesus. Just a tip of the iceberg? Can you give me an example ?
John: It happen in the year of 2007. Heng Jai is the colleagues of my brother. 
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Kelvin: Look at the photo. He is Heng Jai. He is the colleagues of John's elder brother.  He is a Cocaine addict. He is now at KK disco. 
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Mr.Chan (a superintendent of police of Hong Kong): How do you know that he is now at KK-Disco ?
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Kelvin: I hack the telecom.  I steal the physical address of the SIM card of Heng Jai from the telecom.  Of course,  I know it.  You disguise yourself by plain cloths and go there immediately. You pretend to be a Disco goers. And then, you ask him whether he wanna buy Cocaine or not . If he buy the Cocaine, You arrest him.
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Bradley: Kill those students, e.g., Mr. Chan.
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Kelvin : Hey ! Mr. Chan is a naive person. A naive person can't learn any hacking techniques from me. Forgive him. 
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Bradley (angry): Kill him. Can't you hear me ?
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John : Guess what happen.  Take a look.  https://en.wikipedia.org/wiki/Dolphinarium_discotheque_bombing . Miuson killed 20 teenager of Dolphin disco.  
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John : Why did you kill the teenager of Dolphin disco ?
Miuson : Bradley said, "Kill the naive people. ". So,  I killed those kids of Dolphin disco. 
John : Bradley mean Mr. Chan.
Miuson : Oh! Sorry.  I misunderstood. 
John : No,. You didn't misunderstand.  You pretend to misunderstand.  You mean to protect Kelvin's student,  e.g., Mr. Chan.  And,  meanwhile,  You mean to let those non-Kelvin students,  e.g., those teenagers of Dolphin disco,  die. 
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Miuson : No,. I didn't mean that. 
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John : Yes,. You mean that.