Here's a very interesting and thought provoking article you should read! It is about the not-so-glorious past of taekwondo.
Nothing negative said about the art as such. However I think we all need to know the whole picture of all martial arts - not just the rose-painted and hyped up one.
Truly, there is so much politics - so much power play and bull going on, it sometimes make me quite sick. And by all means, this is not just within taekwondo!