The Kovalchuk hate is so unreasonable considering that 10 out of 10 people would do the same thing he did. Make more money in your home country, have everyone treat you like a hero compared to the US where it was unreasonable criticism, and play less games and spend time with your family and friends.
By the way, Lou AGREED to let him go. If Lou said no, he wouldn't be playing hockey in the KHL currently. So it was a mutual agreement, end of story. Kovalchuk didn't just leave on a plane and go to the KHL, he finished the lockout season and left.
He was not only the best forward the Devils have ever had (and his 2011-2012 season along with the second half of 2011 the best any NJ player ever produced) but he was so humble and kind. He was treated so wrongly here after the John Maclean incident and he won over the fan's hearts. There's a reason that most of the arena was filled with Kovy jerseys and it wasn't only because of how good he was but his character at the same time.