Slaves? WTF? Are you so blind to the conditions in much of the world that you think offering a job to someone is bad? Are you insane? These are the best jobs most of the poor in Dubai are likely to have offered in their lives.
It's not right for the first world, so better the jobs don't exist at all? Seriously, I can't imagine how you think this is bad. These jobs are vastly better than early industrial revolution American jobs, let alone no job at all in a place with no real social safety net.
Sheltered suburban enclave American middle class are something else. No sense of perspective at all.