When an NFL footfall player fails to be awesome, it doesn't mean he didn't try his best. If he gets injured, it doesn't mean he wanted some time off. Crawford didn't deliberately attempt to frustrate Cowboy fans. If he was overpaid and failed to perform up to some standard, it's not his fault, nobody would turn down the money and tell the owner "No thanks, I'm not good enough". Blame management, not the player.
Tyrone Crawford was a Dallas Cowboy, we may be disappointed with his career but do we have to hate him? Do we have to exaggerate and say he did nothing? He had five solid seasons in his 8 year career, above the average for D-linemen drafted in the middle of the third round.
Tyrone was drafted in the 3rd round, #81 overall. Since 2000 there has been 41 D-linemen drafted between #75 and #85 overall. Among these D-linemen drafted in the same range, Tyrone ranks 8th in games started, 4th in sacks, and 6th in tackles for losses. He ranks 3rd among these players in QB hits.
Not every player is going to the Hall of Fame. The average career in the NFL is three and a half seasons. Crawford was an above average player, during some seasons he was really good.
Let's wish him the best.