As someone who's spent his life roughly equally split across Bangladesh and America, I thought I'd provide some perspective.
The questions I ask myself about this situation are:
1. Are the lives of the people who work in these factories better or worse as a result of these jobs existing?
The answer I end up arriving at repeatedly is that it is a resounding improvement in the lives of almost everyone. RMG factories empower women to provide for themselves in a way that nothing else in the country can. There simply aren't any other jobs for women in low-income brackets in Bangladesh and I personally know individuals who found the courage to break themselves out of abusive marriages and the ability to say no to marriages they didn't want because of the income they have from these jobs.
2. Could the factories be better?
Yes, absolutely. Most of the owners could obviously afford to pay employees better given the incredible amounts of wealth that the factory owners have accumulated and having gone to school with some of their children, I know quite a few factory owners personally. The reason they don't pay more comes down to simply business principles. The objective of a labor intensive business is to drive costs down the lowest possible amount legally. That is what they do.
3. What is the government's role?
This is pretty simple. They should raise the minimum wage for factory workers, create more stringent regulation and make great effort to ensure those regulations are followed. This is where invalidOrTaken's point about corruption comes in. Many of the factory owners are themselves members of parliament, or have spent a great deal of money getting one of their lackeys elected. On top of that, virtually everyone in a regulatory agency will take massive bribes to look the other way.
When the article talks about that girl's dream being a sewing operator, and you cringe because that sounds so depressing, realize that 10 years ago this girls only option would have been to get married to a rickshaw puller or shopkeeper and hope he wasn't abusive. Today, she can dream of a job, of moving up a ladder and maybe even becoming a manager some day. That's progress even if it comes with a whole host of issues.