In my opinion the truth is as usual somewhere in the middle. I don't mind players leaving clubs we're all grown ups and there are always clubs bigger but it's how the player does it and behaves that's crucial. Lescott frankly didn't turn up in that arsenal game whilst let's not forget pienaar 'wasn't mentally right' to play in a derby match a fact others seem to have forgotten , let's compare that to James Milner who despite an imminent move to city played, scored , got MOM & a standing ovation in his last game. Lescott wanted to leave for big money and to be part of a 'project' whilst pienaar had wanted the same deal as Arteta but money was a driving force for both of them.
Moyes took pienaar back in a heartbeat so it wouldnt surprise me if we did the same again although i think the players age & long term prospects of a deal would probably make it less likely. Large amount of us would moan if he came back but like so many footy fans whatever we say we'd get over it like city did with tevez & united with Rooney and numerous other clubs did with numerous other players .
I've posted before Players move and do so so often without giving an seconds thought for their fans or clubs , one of the most telling quotes I've ever had said to me about football from someone in the game fits perfectly in here "players are c@nts , they just dont care and once you realise that you've got chance in this game".