What are you talking about, he wasn't even allowed to take part in our friendly games in the summer. There's no buts and ifs, he chose Barcelona over United (rumored) and sacrificed 5 months of football to play at Barcelona while aware that he's going into a team that is very hard to play in. Probably sacrificed his form for the Euros considering that he was used very little after he became available (sure, his performances didn't help either), because we were stupid enough to play the La Liga title in the last round even though we had a huge lead towards the end of the season (and thus couldn't aford to use those games to try to integrate Turan properly and went for our standard 11 on a game by game basis).
Of course he needs the same conditions as all players in order to make a fair assessment about his value and his potential to help us. It's logical to offer the same chances for all players and then let the value and hard work of each player to tilt (or not) the scale in their favour. Arda Turan isn't to blame because we fucked up with the transfer of minor players and got ourselves a ban and left him on the sidelines for half a year. He is a collateral damage here, and we need to be patient and wait for him to have a shot at making it at this club like every player in the squad.
And about his games for Turkey, while under no playing time at Barca. Didn't he score against Nederlands for 2-0, assisted the first goal and was overall their Man of the Match in probably the game that made them hope they can qualify? Did he or didn't he? Didn't he assist a decisive goal against Czech Republic in the Preliminaries, right after that as well? If it wasn't for Turan in those games to lead Turkey, they would've stayed at home. Now, he's the enemy. Fucking fans...