Risky strategy?
Is the "healthcare system" viewed as a National Institution in the US like it is in the UK, or is it just seen as a disparate group of businesses and corporate entities?
In the UK at least, I'd assume that any plan to actively & deliberately cripple NHS targets would be considered a national terrorist threat, even if the motive was just money, and not ideological.
Under the current climate, waking up with a bullet between the eyes would surely be a very real consideration for anyone attempting it.
