The norm is that police officers wear guns, the UK is an exception. But even in the UK, police carry guns and rifles during raids – especially if they suspect to be met with armed resistance (as was the case with Kim Schmitz).
Did you read the page you linked to? Guns are only carried by specialized units. While said units will be called in if the circumstances seem to merit it, that's an unusual occurrence; the normal case, even on a raid, is that noone is carrying firearms.
How does any of that contradict my earlier comment?
If the police plans to raid a building which they suspect hosts armed suspects, like in the case of Kim Schmitz, surely they’ll send in units carrying fire arms.
I find that interesting, as police officers in Northern Ireland (part of the UK) do carry firearms. I have to admit I know little about either Irelands, perhaps the situation in the Republic of Ireland is a lot less volatile.
In your country, police officers don’t carry guns and tactical units are armed with flowers?