Arsenal are a "selling club"* just like we are . If a player wants to leave they will. Just like Downing, Milner, Barry, Young wanted to leave us. Song, Van Persie, Fabregas, Nasri all wanted to leave Arsenal.
* The whole term "selling club" is completely pointless. Man UTD are a selling club 'cos they sold Ronaldo against their will. Every team sells players they don't want too.