how about 'because it is an authoritarian single party state'?
"improved in modern terms" is very twisted language - perhaps you'd care to explain what you mean by this specifically
safety, cleanliness and stability are all pretty straightforward attributes of authoriarianism . Unless we want to reconsider our concpetion of 20th century governments usually deemed 'backward' which also achieved this, I'm not sure we should call this 'progress'