Arsenal fans doesn’t have any options than to accept the second position every season because that's the best they can get. Even during Arse Wenger's reign, Arsenal was a business club so I don't see why they will be mad at Arteta who is always finishing on second positions recently.
In the past few seasons in the English Premier League, the teams in the first position of the points table have changed, but the teams in the second position of the points table have not changed. We have seen Arsenal finish second in the points table for the past few seasons. Arsenal have been competing hard with Manchester City for the last few seasons and they have finished second in the points table with a tough competition with Manchester City but this season they are not competing with Manchester City but are again competing with Liverpool. Now Liverpool are at the top of the English Premier League points table and Arsenal are second in the points table. Arsenal and Liverpool also have a considerable gap in points, so looking at the performances of the two teams and the current position of the two teams, it seems that maybe Liverpool will win the Premier League title and Arsenal will finish the season in second place again.
If we compare from wenger era at Arsenal, they are actually much better and stronger now in last few seasons, But their weakness are not different at all still mentality and also consistency, althogh they still play fast, aggressive, and organized, but without the depth of a winning mentality and consistency with good squad depth of course it is in vain.
Last season their looked very Spartan competing with Manchester City but when Guardiola squad stumbled this season, Isn't this season should be an opportunity for them to win the title?
But unfortunately they don't have what it takes(mentality and consistency) to be winner, so I think they're not yet ready to become champions and Arsenal fans should accept that the reality although it is bitter

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Manchester City won the Premier League title in the last season but Arsenal's performance in that season was excellent and Arsenal fought hard until the last match and until the last match it seemed which team might win the Premier League title. Because in that match the equation was that the winner would win the Premier League title but in the last match Manchester City won and Arsenal lost and that was where the result of the match was decided. However, even if Arsenal failed to win the title, they proved that they can still compete. Arsenal performed competitively last season and they are doing so competitively this season too so Arsenal fans can expect their team to fight Liverpool till the last match. If Arsenal can overtake Liverpool to win the title this season, it might be a season to remember for them.