The PPO's are taking it seriously and that is why Meghan shutting her own door is a nono as, should a crazy get past the police, there is nowhere for Meghan to go because the car door is shut and most new cars automatically lock.
We know the seatbelt alarm is turned off so the PPO can do his/her job without the alarm driving everyone nuts. It also seems that they will be looking into modifications to the automatic locking system. Now if that doesn't scare you it sure scares me and the police.
The Queen and Kate shut their own door. Where are the articles about them? The British media is so biased against Meghan.