Kratom represents a new chapter in the failed war on drugs that was begun in this country after the prohibition of alcohol was ended.  The prohibition of alcohol was a failed effort that caused a great deal of crime and violence, and the ongoing war on drugs continues to ruin the lives of countless thousands of people who might otherwise go on to make meaningful contributions to society.  If you think these words are extreme, please read Chasing the Scream by Johann Hari, an excellent and detailed documentation of many facets of the war on drugs. 
If you do not have the inclination to read an actual book, you should at least listen to this podcast, in which Mr. Hari is interviewed, and provides an abbreviated version of some of the things he documented in his book.