Can someone please tell me how being told that you are "too qual

Villas - Can someone please tell me how being told that you are "too qualified for a job" is still a valid excuse for not hiring a good employee? All the while you have people with no training given jobs and have absolutely no clue what they are doing just because they are hired within a company and have more time. People are tired of wasting their time to be constantly looked over. If I didn't want to be too smart for a job I wouldn't have gotten the proper training. The chain of command rule has to go. Some HR departments need some investigation done. People are not stupid and we can see what's what.