I amazes me that the pilot personality contains so much scepticism and disbelief. Since the beginning of instrument flying, pilots have encounter CB's, told the story of undescribeable turbulence and horror to anyone who would listen, yet most pilots dismiss these tales and blunder out to make the same mistake, frequently with tragic consequences.
I fully expect this type of event will repeat itself forever as long as human pilots fly airplanes, simply due to the personality traits that draw a person to a career of aviation.
Countless pilots have pentrated weak CB's successfully over periods of many years, only to re-enforce their belief that CB's aren't that bad and the horror stories of massive encounters can be dismissed as incidents told by scared wimpy pilots.
Back on the days of flying the airmail, we had pilot killed busting a line of midwestern cold front thunderstorms. He was said to be a great pilot "because he was right side up" when the cb slammed his plane into the mud.
God help any pilot who thinks they can handle a severe CB.
BFD (not wimpy but still scared of CB's since May 12, 1982 )