Conceding a goal and going behind to a team as hopeless as Southampton is pathetic yes, indicative of the fact that because the attacking options simply weren’t good enough that we were pushed too high up in order to try and take the lead.
The first fault is clearly determined by the second. Why would you feel inclined to gamble when you know your attacking players simply aren’t good enough to score from half chances.
So it all comes down to one thing that Arteta has neglected the squad in terms of attacking players.