Well my reasoning is simply this: despite all those things you accuse him of, Wenger has kept us in the top 4 every year but this one in which we narrowly missed out.
IMO the PL is a more competitive league than La Liga, more teams can credibly win the league, there isn't a duopoly where it's generally Real or Barca winning the league.
And yet you seriously think Wenger could take over one of those sides and they'd struggle to finish top 4.
This is the sort of nonsense which makes it hard to take any of your opinions seriously.