I love how there's all these science and software experts who think this is impossible, when it is clearly very easily possible. It's not a question of if it's good (it isn't) or if they should (they shouldn't).
Hiding your heads in the sand and collectively saying they can't - in a pro-privacy group - is insane. It's like reading about how you can hack an air gapped computer and having a bunch of Amish say it's impossible.
Maybe figure out how they are first, then talk about what to do about it. But this collective "nuh-uh!" is nuts.