It doesn't matter if it actually makes a difference. These sorts of training seminars are marketed and sold to executives so that they can claim that they've done something about a problem. Whether or not they work is completely immaterial to whether or not companies buy them - all that matters is how it looks in various lawsuits.

"We've had racial sensitivity training and fired the offending manager" can be the difference between settling a discrimination lawsuit relatively cheaply and getting taken to the cleaners in a civil case with legs.