It’s not associated with ghettos in the US, either, almost by definition. A mural implies a property owner has usually paid and maintains a piece of art for public consumption. For the mural to survive (no actual graffiti over it) means the community respects the investment and property, too. Ghettos are areas of abject poverty where that sort of community for structural reasons isn’t happening.

Just because the suburbs don’t have murals doesn’t mean that urban areas that do are dangerous.