I don't buy the snake did it, if it did it was like was said the kids were playing with it and it inadvertently killed them. No way did this snake climb up the vent, kill two sleeping kids and then just lay there.
That said I do believe there should be more control over owning animals like this. The number of these animals that die young because of poor handling, and them becoming invasive species because of people letting them free is sad. If they were controlled and you had to have an inspection yearly and account for it maybe people who don't really understand what it takes to care for a 15' snake wouldn't jump in so readily. It beats them being banned outright.
Thing is, this was a pet shop owner and someone who SHOULD have known better than the general public. It wasn't owned/improperly contained by some random Joe Schmoe that thought it would be cool to own a giant snake.
There are a ton of people who DO own these kinds of snakes, and the snakes live long healthy happy lives. You just never ever hear about them because they never do anything newsworthy.
If a species has the potential to become invasive in a local environment, then the local government is more than within their rights to regulate ownership. I don't think it should become a nationwide ban however, or have nationwide restrictions imposed.
For one, where is the money for yearly inspections going to come from? Even if you charge a several hundred dollars for a yearly license fee (which would be ridiculous by itself) it's not going to be enough to pay for some authority to go around inspecting housing.
Until the autopsies come back saying that yes, the snake is responsible, I'm going to say this seems VERY odd. To me it smells like something else went wrong and someone is trying to pin it on the snake.