Why is Joey Harrington still blamed for all the Detroit Lions problems?

The Lions are 2-14 and 5-10 since he left. Harrington set Lions’ rookie single-season passing records in yards (2,294), TD's (12), attempts (429) and completions (215). He also set franchise rookie single-game records in yards (309; only 300-yard passing game by a rookie in team history), attempts (44) and completions (25). This proves he was a decent quarterback his first year, and it was the team that resulted in his failure to have winning seasons after that. A quarterback can only do so much, and then you have to look at the organization as a whole. Harrington is a graduate of the University of Oregon, and was a three-year starter on the Oregon Ducks football team. In his senior season at Oregon, he threw for 2,415 yards and 23 touchdowns, and he finished his college career with a 25-3 record (including bowl wins against 12th-ranked Texas and 3rd-ranked Colorado), 512 completions in 928 attempts (55.2%), 6911 passing yards, 59 touchdowns, 23 interceptions, and 210 rushing yards and 18 scores on 145 carries. A Business Administration major with a 3.23 GPA (twice earning honors with a 3.34 GPA),[1][2] Harrington's 7,121 yards of total offense rank third in University of Oregon history.