How would you like it if YOU ended up on that list after having committed no crimes?
It's all good until it get's pointed at you, isn't it? Highly impractical and even more invasive. I'm glad you're not in charge!
I already operate as if I am, FWIW. I'm not on Facebook and am extremely careful to re-read my emails before hitting "Send." Don't put anything on the internet that you don't want the world to know. If I were stupid enough to put anything out there that would raise red flags, then I would say I deserve to be on a blacklist denying me the privilege to own any type of potentially-harmful device. That would be "internet-Darwinism" at it's finest.