My opinion is of that we don't have the mentality to fight for a title throughout the duration of the season. The players take a large part of the blame in this but so does Wenger, he's the one who has been in charge of numerous Arsenal sides over the past 12 years that he built, all of these teams have collapsed in title challenges irrespective of the opposition.
Of course we do win "pressure" games, we win more games than we lose but the facts are that Wenger led Arsenal teams collapse in title races, it's not a conspiracy, the facts are there for us all to see.
We can dissect all the key matches season by season and honestly I don't really know what the root cause is, but there is something inherently wrong with the teams Wenger builds and the mentality within these teams because irrespective of personnel, Wenger led teams collapse in title races.