Arsenal vs Spurs who is to blame?

Arsenal have finally lost the match. Simple reasons, arsenal play very poorly when they are under pressure. Ozil lowered tension by scoring very early in first half but arsenal wasted an advantageous moment where they could score at least two goals before half time. Wenger's strategy also failed the club,they could not interact successfully since they were not used to it. The strategy made some players like Giroud and Carzola act as if they were not involved in the match. Wenger should consider his strategy so long as the players can find each other in a successive move. Welbek was not fit in the match as he had some injury n could not give what is expected of him,Walcott could have started the match.
Arsenal losing 2-1 to spurs depicts the possibility of not appearing in the top four leave alone winning a trophy.