Because LeBron won more earlier in his career and didn't take two years off to play baseball. If he had quit for two seasons folks would crucify him for not loving the game or having competitive drive
When LeBron's father is murdered at the height of his fame like MJ's was, we can discuss the merit of whether LBJ would be excoriated for stepping away from the game. Likewise, it further speaks to Jordan's greatness that he could step away for 2 seasons, train for a totally different sport, return to the NBA 2 years older, and resume his dominance in 3 more Finals.
6 Championship and 6 Finals MVP's will be hard to ever top, IMO.