Criticizing players who are not playing well or even badly is not "turning on them". The reasons, for example Gueye being several shades of awful to rather poor this season could be many, including general team malaise, Koeman, lousy tactics, or just that Gueye , shone for a while after he signed and has failed to recover that form. In his early months here, he was compared by some with Kante, which was as ludicrous to say then as now. Schneiderlin is getting stick, same comments above apply to him; he was a wonderful signing according to some, but now is heavily criticized. What else can supporters do when mega money footballers play badly and the team is sinking? Get behind them and support them of course. If only that was the simple solution.