They're told not to.
They're supposed to try and encourage the free-flowing nature of the game and ignore minor rule breaking. Just like players ending up walking 10' closer to opposition goal before actually throwing the ball... Or goalkeepers not supposed to hold ball longer than (is it three seconds, or six? Either way... Every keeper breaks the rule).
If the rules were followed to the t, the game would be very stop-start.
but this is where borrowing form what rogers said in hockey would help.
you time waste then change the ball to an attacking free.
Keeper holds ball for 30 seconds (i thin the rule was changed a bit and mingolet was the only one i've ever seen punished ever) ok... but say pickshite flops over a ball a 2 year old would catch and rolls on it and slowly gets up. Ref blows and awards indirect free in the pen area. i can gaurentee he'd never do it again. Yellow is no punishment. they'll all take a yellow.
Steal 10 yards on throw. blow, and reverse. player acts up. sin bin for 5 mins. move on.
Its then about quick enforcement and educating negative coaches and players their actions hurt their side.
slow goal kick. award a corner instead.
slow throw, reverse it.
steal ground, reverse it.
stand on top of a free to stop it being taken. 10 yards closer to goal
keepr holds ball, make it nearly a pen against as they get away with absolute murder
But IMO the thing mr wenger blatantly ignores is players faking injury. drop and roll. refs stopping play should have to enforce a 5mins sin bin for player irrespective of conidtion. Play on if a player drops until he either gets up or signals for treatment. If he asked for it then it should be proper and off the park for minimum of 5mins. Players rolling back onto field. etc etc etc its all cheating at a low level designed to kill the flow of football.
The prime example for me was the disgraceful scenes at anfield. Richarilson heads ball out. runs 25 yards out so hes not playing anyone on. dops and holds head and rolls about until and everton play kicks out at one of our players. complete and utter cheating. then colemans runs in and hits one of our players looking for a reaction. all premeditated. not one thing was done to any of these players by the ref. nothing.
richarilson then again faked head injury later in game to try the same thing on.
believe it or not there are "fans" would would state that smaller teams have to be able to offset the unfair advantage big teams have in talent by doing this. Its the most moronic stupidity going.