Nothing safe about having a slave labor force. Undernourished people en masse are reservoirs for disease.
So much ignorance in your post. Expat workers in Dubai eat very well. There are free high-quality-food banks all over the city for some who do not have enough to eat.
Reason for low crimes in Dubai,Singapore,Cruise ships, is the same. Better wages and better food than expats can get in their native country. Very few will risk getting banned for life by committing petty crimes.
Try wandering the streets of Chicago’s South or West sides. America has been Ghettoized.