Blaming your teams poor performance on a negative mental block is absolute lunacy. Or perhaps it is some form of a security blanket created in order to protect yourself from the underlying truth; the United midfield controlled the tempo of the game due to overpowering a weak Arsenal midfield. United were the better football team on the day. Looking beyond that is more about your own personal mental state than it is the Arsenal players.
It's easy to over analyze when our team performs below expectation (I've been guilty of it myself) when the simplest answer is generally the one that's closest to the truth.
The reality is teams nearly always play better at home and worse away. Last year we destroyed you at The Emirates and you destroyed us at OT. The mental block and home advantage of the atmophere is definitely a thing that affects most teams and refs in turn. We see it all the time in Europe.
In the past Arsenal have attacked away from home, played good football but got hit on the break and lost. Much of Mourinho's successes against Wenger came because Wenger's teams were attacking and far more open giving counter attacking opportunities.
This time Wenger set up to defend and counter attack. Elneny and Coquelin the most defensive pairing in midfield. Ramsey on the left is another defensive tactic to try and increase defensive cover. Arsenal didn't commit men forward and sat back deep rather than pressing.
Mourinho in turn set up to play cautiously. His low block stopped our attacks as did his high press. But not enough men were commited forward to create much in the way of good chances. United didn't commit DMs/fullbacks forward until they scored. And then they dropped deep to defend all while having their weaker CBs fielded. Wenger adjusted his team, by playing Chamberlain at RB, Giroud up front with a DM off and an attacking DM on for a ball winning DM. We didn't do much until the goal, but the goal was a result of the tactical changes of both teams. Both teams scored when they overloaded the amount of men that they were commiting forward. Giroud scored when he had Koscielny, Ramsey and Theo all in the box for the cross.
In fact if you were looking at any area of the pitch for Arsenal to have success it would be Walcott and Chamberlain against Blind and Rashford because Rashford is a CF marking a winger and Blind is occupied with Walcott.
Wenger has actually gone against his own philosphy of attacking football and employed Mourinho type tactics to get a result away from home here. Mourinho's philosphy being against the big teams minimise any chance they can have and further minimimise it away from home by sitting deep behind the ball.
The only difference between this attacking lineup and previous games was bringing back Ramsey, who Wenger clearly thinks is part of his best XI when fit. Plus he should, in theory, add some extra steel and quality to the centre of your midfield. It's nonsense to suggest that Wenger's team selection and approach was intended to cede the midfield to United the way it did and/or responsible for Arsenal creating so little.
I can guarantee the exact same team will be much more dominant and create/score a lot of goals against lesser teams than United between now and the end of the season. You'll need Ozil and Sanchez to play a lot better, though. Will be interesting if they carry this weekend's crap individual performances into the hectic schedule in the week's ahead. That would guarantee the annual Arsenal cold weather slump.
It isn't though, several tactics were clearly defensive, sitting back defending tactics. Firstly the midfield pairing of Coquelin and Elneny is the most defensive. Xhaka is a far better passer than either men, if you're planning to be in possession you start Xhaka if you don't have Cazorla. The plan wasn't to be in possession it was to protect the defense.
Secondly we didn't commit men forward, we didn't until we were chasing the game. Thirdly we didn't press in order to not overstretch our defensive lines. Lastly, yes Ramsey is favoured but again it's partly to break up play and track back, something Iwobi/Chamberlain don't do. It's another defensive tactic.
Let's revisit this at Emirates and see regardless of result who has more possession and creates more chances. Do you think it will be a similar game>?