I did not read your original post, but I guess by "should be fixed where the modern slaves come from" you are talking about poor countries or poverty in general

I did not read your original post, but I guess by "should be fixed where the modern slaves come from" you are talking about poor countries or poverty in general. If so: Poverty is not the cause of slavery as a symptom, the symptoms of most poverty in the world today are bad working conditions, low pay, etc which workers do voluntarily, they mostly don't have another option than taking mean jobs, granted, but they can switch their employer, try to build a small business, etc. They can't do that if they are de facto slaves, living in a country where they have almost no rights and which they can't leave. My point is: bad jobs are a symptom of poverty, slavery is a symptom of very bad politics, despising human rights.