This is why technologies such as these need to become widespread
quickly, otherwise you get tools such as these where "50 percent of their users are pedophiles" or whatever.
Even though the technology itself has no fault of its own (the technology is neutral, I'd say even more so than say guns, which are meant to kill people, one way or the other), the government/public will say it's "evil technology" helping bad guys. I mean they even try to do that with HTTPS now.
Imagine if HTTPS only came out now, and it could somehow be implemented in people's computers/browsers by individuals. Who would use it first? Probably the criminals, mostly. It would be too geeky for "regular people" to even want to do such a technical task. And they'd see no need for it. After all "who's going to read their email? Emails are private, right?"
In such a case, law enforcement could quickly ramp up lobbying in Congress to warn about the "dangers of HTTPS encryption", which is used by mostly criminals. And it would probably get banned, before anyone at Google, Microsoft or Apple even gets a chance to look at it, and before it's used as a technology for e-commerce. It would get a "bad reputation" just like torrents and other stuff, before it gets a chance to develop a good one.
This is also why I'm hoping Firefox adopts a "private mode" to replace its incognito mode, that's powered by Tor. When tens of millions of people use Tor for everyday stuff, I doubt it will be "just pedophiles" using it. Pedophiles exist whether there is technology to protect their (watching?) activities or not, and it's something they do because that's how their mind works. So I doubt we'll all turn into pedophiles once we all get Tor.