I'm all for punishing these firms for wrongdoing but the government could be overreaching here. What they are doing is purchasing dumb order flow and providing a benefit to these folks for it (the benefit being commission free trading)
If you are a good trader, this is great. In some instances, having your order go through a dark pool/internalizer is a good benefit to you. In others, its a big disservice. If you can identify the situations, you can cut down your trading costs. Here is a guide of when to look for price improvement through dark pools/internalizers and when to avoid it
http://www.beathft.com/?p=75
I'm not a US citizen so I can't trade with Robinhood but I'd bet that if I could I would find some instances where it would increase my profits. I wouldn't trade it for every order (that would be crazy) but I would find situations where I could add it to my toolbox. For a good trader, this type of deal is great
Now, if they are breaking laws then of course, they must pay for it. But this could be just a situation where there is appeareance of wrong doing. At the end of the day, dumb retail will lose all their money. its just a matter of who will take that money