Well it's true Jurgen was to blame for the poor performance of his boys but I guess he had settled within himself that in life you lose some and win some. Imagine this were the Premier league I doubt he'd do that because there will be a lot riding on his decision. Let's say he had to sub his best players to bring on the average ones so he can at least rest them for the game in front with Brighton as I regard that game more important than this one they played against Man UTD.
Right now, Liverpool are second place with 64 points but the Gunners have the advantage over them with goal difference and I don't think they will joke with the game by letting the opposition take advantage because that would mean a drop in points and I doubt they may be able to come back if that should ever happen.
Even though I also think substitutions were one of the causes of Liverpool's defeat, I can't blame Klopp at all. Because we know that M. Salah is actually still quite susceptible to re-injury. Even in interviews last month or a few weeks ago, we knew that Klopp would try to play their core players more carefully, especially Salah. And maybe Liverpool attach more importance to the Premier League. Although I know Klopp also has ambitions in the FA Cup. But it seems that Klopp also realizes that with so many injured players, Liverpool must save more energy for the Europa League and Premier League matches. But I don't know what is clear, I am also quite disappointed with the results, although I can understand that. Oh yes, Man United seems to be starting to have quite high self-confidence again.
This is not Kloop's fault because he knows that his important players are still very reliable for future matches. If important players experience bad things, Kloop rotates to avoid things like that and this is a good decision even though in the end Liverpool has to be defeated by Man United. . However, Liverpool can focus on the EPL and UEL because Liverpool still has big opportunities in these two competitions and Kloop really has the ambition to win 2 titles in his final season with Liverpool.