Come on be serious, do you really think player have intentions to shooting the ball at someone's arm in that scenario?
If you have the whole goal or a player who is likely to score a goal to aim at then why would you aim for an arm?
Whether they intend or not they shot the ball at their arm, I don’t see why a player should be penalised for that. If there isn’t movement towards the ball from the arm/hand it shouldn’t be a pen, there has to be an element of deliberate. That was mostly how football was in the past and it reflected the spirit of the game. This penalty merchant jobs worth crap that incentivises players to try and kick the ball against opponents arms to win pens to me is wrong.