Yes Wenger should go, he CAN'T sort out a defence, we won't win anything important without a defence, teams like Liverpool being unable to score or Spurs falling to pieces doesn't make Arsenal's defence better, it means our defence wasn't tested(as much we've conceded against teams playing woefully badly on this run multiple times).
The defence for the second QPR goal in particular was SHOCKING, when you see the right camera angle you see the ball go down the right, someone in the middle and 2-3 QPR players suddenly run forward to support..... no Song, no Arteta, there is the back four and a good 30 yards further back at least is Arteta standing still, Song/Arteta/anyone didn't even try to get back and that isn't because it was a quick break, Diakite ran forwards very late, nothing at all would have prevented our midfields getting back first IF they ran.
This is a simple problem Arsenal have had for 7 years, DM's not running back to cover the midfield runners into the box, even when Song is in the box he is ball watching not watching the runs and marking them.
We won't ever win anything meaningful again with Wenger. I won't, and will never base my opinion on how well Arsenal or Wenger are doing based on other teams doing even worse. We're worse than last year, in a worse(easier) league, bought VERY badly and I don't even slightly trust Wenger to improve us in another transfer window.
We've gotten worse for years under Wenger, we will continue to get worse, he hasn't learned a single lesson in the past 10 years in the league, he won't learn any in the next 10, his methods, thinking are NOT working, will not work and will not change. The only way forward is a new manager.