Is It a Bad Thing That Manchester United Fans Left?

Manchester United lost 3-1 to Manchester City in their Premier League clash. A number of fans were seen leaving the ground at half time. Andy Townsend says he wouldn't have left before the final whistle. The setup didn't seem right, did it? It looked even before United went behind like they were struggling with the current setup. But I still think there are opportunities for United if personnel or structure is better.