Why is it so common in Western countries?

Because all this sort of degenerate behaviour is now seen as "in" and "progressive", so this is why they believe this makes them some sort of advanced and progressive society if they permit shit like this.

What they don't realise is that as history has shown us, liberal, degenerate and ultra-tolerant societies, have always fallen flat in history, and I have no doub that West will fall just as hard as, for example, Rome did.