What In The Hell?

Can someone explain to me just how in the hell the following two athletes are left out of the Pro Football Hall of Fame -- Cris Carter and Shannon Sharpe? When invitations to Canton are handed out, how can you not include these two gentlemen? Let me give you the names again -- Cris Carter and Shannon Sharpe. They are not in the Hall of Fame? Really? How can that be?
Let's take Cris Carter. Eight straight 1,000 yard seasons. Third all-time in receptions (retired second in receptions). Seventh in receiving yards (since his retirement, he's been passed by Isaac Bruce, Marvin Harrison, and T.O.). Fourth in receiving touchdowns (since been passed by T.O. and Randy Moss). When he retired, he clearly had established himself as one of the top receivers in the game. He's been passed by people who are clear Hall of Famers (with the exception of Bruce, who benefited from being in a pass-happy offense and ran up a lot of numbers). Without question, he was one of the top receivers in his era. And being the best in your era makes you a Hall of Famer. Him not being in is a disgrace.
Same for Shannon Sharpe. When he retired, he had the most receiving yards for a tight end. Not only that, but since he broke onto the scene, the tight end has become a more important position. Faster people play tight end because of what Sharpe did, stretching defenses and putting pressure on the linebackers. He helped change the position, and he should be recognized for it. I mean, he blocked for two 2,000 yard rushers and won THREE Super Bowls. Yet neither he nor Cris Carter are in the Hall of Fame.
Canton -- what a joke.