In 2012, the “Israel-right-or-wrong” crowd continued to cheapen the very serious issue of anti-Semitism.
The first are books that bring added value to the popular, the second cheapen the whole proposition of publishing.
1570s, "ask the price of," from cheap (adj.) + -en (1). Meaning "lower the price of" is from 1833, but figuratively, "to lower in estimation" is from 1650s. Related: Cheapened; cheapening.