Nobody has so far taken the troll bait... so... here's a slow clap for u....
*clap* *clap* *clap*
Now, others have stated it wouldn't be a good idea, and you've come out and decided to scrap the idea, but for others who may be toying with the idea of teaching about discrimination or other things in the classroom remember this...
In a lot of contracts there is a clause that prohibits a teacher from actively participating in politics while in korea, (outside of posing for pictures on dokdo that is)
One thing to keep in mind are the parents of the students have their own problems in this country with racism / discrimination against south-east asians. If they feel you are making them look bad by talking about how the powerful oppress the weak at times and this should change, well, you may raise the ire of the parents and put your job in jeopardy.
Just FFT.
I usually save these discrimination discussions for my adult korean friends and relate the treatment of SE asian immigrants to mexican/other immigrants in the Us and explain how the situations are similar, different, and what could be done to improve everyone's lot in life.
Usually the conversation is taken well and no-one gets all bent out of shape. I make sure to strike home the notion that the USA has more than its fair share of racial problems even today.