Make them watch the "Death Camp of Tolerance" episode of South Park.
This is the one where class teacher Mr. Garrison attempts to get himself fired for being gay by shoving the class gerbil Lemmiwinks into Mr. Slave's "tight ass." When the schoolchildren complain about this they are sent to a "Tolerance camp" where screaming SS-type guards force them to draw pictures of "people of all colors and creeds holding hands beneath a rainbow." Meanwhile, back at school, Mr. Garrison wins a Courageous Teacher Award for overcoming adversity. At the end, ask the liberal why he didn't laugh very much.

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18