Can someone tell me why this is banned in some European States?
The logic goes like this: fundamentally, Visual Flight Rules is about
:
1) the visual avoidance of other aircraft
and
2) the visual avoidance of terrain and obstacles
You can't do 2 at night, at least not with reliability, since the terrain and obstacles are not all lit. Thus the substitution of a minimum safe altitude is required. That is one of the Instrument Flight Rules.