I think it's because that mostly happens behind closed doors in private property - there's all sorts of scope for that few percentage of natural assholes to abuse the power they wield, plus as you say, it's sort of culturally acceptable. I too would like to see that changed.
That said, would you destroy a whole class of employment just because of a few bad apples? Or even more than a few? I also know that for uneducated girls from villages in Indonesia, working overseas as a maid is like winning the lottery. The alternative is often to become a prostitute. Where's the line?
And FWIW I've had a maid before and I don't think it changed me at all. But you're right - there's a certain type of person for whom having a little bit of power over a person unlocks something dark inside them, and in a domestic setting that can be a recipe for mistreatment. More regulation is needed - Singapore's laissez-faire attitude fails it here.
I was talking more of the construction industry, where stories of abuse are much less common (and there are witnesses and company licenses at stake) - in this context, migrant work is IMO an inarguable good.
This is pure anecdote, of course.
In some cases they are supposed to be students, but are forced to work 40hr weeks in low paying jobs under threat of instant deportation.
This bugs me about my own country too.
http://www.smh.com.au/national/one-in-five-migrant-workers-o...
http://www.smh.com.au/comment/tackling-the-exploitation-of-i...
http://www.abc.net.au/news/2016-07-13/international-students...
http://www.abc.net.au/news/2016-10-15/ombudsman-report-revea...
But the immigrant worker thing bugs me.
These workers, mostly women, are treated very poorly from what I have observed. I have heard my sister threaten her nannies with deportation for not complying with her orders, and have seen and heard of other ex-pats behaving even worse towards their immigrant employees. It seemed to me to be so normalized, that my sister and her friends do not recognize their behavior as being in any way abhorrent.
I would hate to see that sort of tiered society in Australia ever. It might work on paper but it also changes the nature of the people they serve in an ugly way.