The team is broken. We do have average players, but not one of them, even McKennie, is this bad.
This is on coaching, this is on managing (SL fiasco certainly had an influence on the team). If players don't feel calm, if they don't feel secure, if they don't see an authority when they see their coach, this happens.
Many of these players are proven winners. Others have a lot of talent. This team is not even close to not being fixable. Without CL money, though, the task to fix the team becomes harder.