I wouldn't call those slack in the same sense of the word because rules aren't being bent or ignored. Helmets and umbrellas are things that are simply too widespread to have adequate enforcement on, same for seatbelts in most countries... so I don't consider that actively letting it happen or "slacking" the same way.

Foreigners might have some slack in some ways but in many ways it's quite the opposite... so there's both good and bad IMO.

"Free to be normal etc." I don't consider that slack either, that's just having a generic free society to me.