Ah, yes...the UK, where law enforcement consists of yelling "Halt, or I shall yell 'Halt!' again!"
It's funny to see you make a mockery out of this, but the fundamental issue is very sound. In Europe, the police has a monopoly on violence. The general public is not allowed to posess/carry firearms, as a general rule. Thus, there is no arms race between the police and the general public. And because of this, police officers are basically only allowed to use their firearms in self-defence. (*)
So if a police officer even draws his weapon to help enforce his authority during an arrest, without the police officer being threatened by the suspect in any way, he/she is subject to an investigation and might be reprimanded or even lose his/her job. He/she doesn't even have to fire a bullet for that. Just threatening someone with the use of a deadly weapon is already seen as excessive violence in a lot of situations.
So to make an arrest, police have to use less threatening means. Indeed, their voice, or by physically overpowering the suspect. Or any other means of violence that's proportional to the situation. But the police is taught that it's far better to defuse the situation somehow, than to increase the tension by using uncalled-for violence.
And you know what? It works. And it makes society here generally a better and more friendly place to live in. John & Martha would never have been arrested at gunpoint here, even if the police officers would not have an SOP for stopping a (stopped) light aircraft.
(*) Obviously there are exceptions. If an arrest of a hardened criminal, thought to have firearms, needs to be done, then the arrest team will blaze in with guns drawn.