Puritans
Funny that some people blame puritanical 'Mericans for this kind of thing.
The reality is that trademark law which denies protection to offensive trademarks is the same in most countries on earth - pretty much word-for-word actually.
There are a few notable exceptions such as Australia, where a trademark must be 'scandalous' before it can't be registered.
So, unsurprisingly, trademarks like "Pommie Basher" are ok.
Have fun searching for your favourite sweary trademarks on the IP Australia website