Be fair, we in the UK don't have the gun issues the US has. Raiding a property here isn't as much of a risk. Probably the same across Europe. The trick for us is to keep it that way. To try to be kind to US law enforcement, I suspect that part of the reason they like to be so spectacular, is an attempt at a deterrent.
Imagine the dumbest, most brutish cunt you knew in high school. After he failed at life for half a decade, he became a cop. I think that that has more to do with it.
That honestly isnt my impression of any Brit police office I have dealt with. Granted they do like their power, but generally, I have found them to be mostly OK. High on the power, jobs worth, arrogant, yes, but not that dumb and/or brutish. That said, I have not been under any sort of crowd or riot control. So, possible they roll out the big dumb heavy wing of the police force there.
I assume you are talking about US police? I have no experience of them. Well, apart from watching US TV and movies!!!
Armed raids are comparatively rare in the UK, and when they do take place, they are far less spectacular than in the US.