Why is the NTSB targeting gadgets instead of bad drivers?
Because it is always easier to come up with a technological solution (even if it doesn't work) than it is to address the real (usually human) problem.
This really illustrates the absurdity of the claim that phones are to blame for the problem.
If you're using a hands-free device, you're just basically having a conversation with someone who isn't actually in the car. It's not going to be any more inherently distracting than having a conversation with somebody who is in the car. So if hands-free phones are a problem... So is talking to a passenger.
Wrong.
1) Your passenger is an additional set of eyes on the road.
2) Talking to someone over a phone (even hands-free) requires you to be mentally in "another place" with them. I'm not explaining it well but I am sure that you get the idea.
3) It has nothing to do with dexterity (using your hand). I have seen pedestrians cluelessly crossing the street at a red light while yakking. Why? Because their attention is in that "other place".