Are we (United fans) part of the problem...?

Yes, we definitely are a huge part of the problem.

Just look at the Bruno threads were fans are aggressivelt defending him, holding him up as some sort of example of what we should expect from our players.

The standards and expectations are flat on the floor, and that is as much on the fans as it is on the club itself.
 
There's just no pressure whatsoever on the owners or the manager. We are on 3 wins in 9 games this season (against fecking Barnsley, Soton and Fulham), and we could easily lose against Villa, but do you think ten Hag feels any pressure? Not really, there's just clapping (and occasional boo) + the hierarchy talking we're all good and not taking rush decisions. It's not surprising many players for the last decade felt like it's ok not to give a single feck!
 
Yeah we are too accepting of the lowering of standards. That's a real problem.