I wonder why he gave up the game. He is only 41 years old. Is he really rich now and tired of it? Does he think that his chess brain will do any good in the world political chess game? Maybe he believed that he was losing his ability to be the best chess player in the world.
Picking out this ONE Russian president to seek change isn't going to do much good. The Russian system goes far deeper than one Vladimir Putin.
Like anything, quit while you're ahead unless you're willing to put the practice and effort in to it.
Or maybe he realized that its time to something else on this earth other than playing games! I don't understand how anyone could devote thier life to perfecting a game, and those who admire/worship the players.
ITS JUST A GAME!!!!!!!!
He probably noticed that all the GMs who play too long end up completely, utterly raving insane.