they
wanted
to give the goal, it's that simple.
They tried 3 times to disallow it!
Refs are terrified of giving calls against Arsenal because Arteta goes fucking psycho every time. He's been on their necks for over a year now and it shows with the treatment they get from referees, particularly in tight calls.
It was a clear goal. Be angry at Gabriel for not standing strong on his man, be angry at Raya for flapping a simple cross, read the rules and get over it.
Go for it. I'm about the same size as Gabriel and would have no problem standing up without going down like Gabriel did. The reason Gabriel went down is because he deliberately went down to try and flick the ball away, which is exactly what the refs have said here.
The rest of your post is Le Tissier level conspiracy nonsense. You get tight calls your way all the time.
As for Arteta being on ref's necks. He absolutely obviously is. He never shuts up about them! He got one fired just last year!