Exhibit A: David Hahn, also known as the boy scout who made a nuclear reactor 1994.
https://en.wikipedia.org/wiki/David_Hahn
https://www.youtube.com/watch?v=55D7qcME_no
Let's think about it for a moment, this kid managed to make a whole room have 1000 times the normal background radiation with a very low-budget. And this was in 1994 when you couldn't simply read stuff on the Internet easily... and it was a kid doing it. Maybe brighter than usual, but still a kid.
Technology is becoming insanely more dangerous each year and many things that only military and secret agents had are now more easily available to civilians who have a little know-how.
The dark web will probably in time make the sharing of dangerous technology more common.
3D printers - can create a lot of issues in the future. One could potentially build WMDs in his backyard. (Eventually, with enough centuries, we will get there, it's only a matter of time till someone can basically get some raw materials + some computer script off google and create mini nukes or whatever.)
Now, we can handle local threats, but anything that does large-scale destruction or spreads radiation - that's game over, they can make entire plots of land uninhabitable for generations. The cost of policing will rise exponentially and it only takes 1 slip up for the whole world to go to shit.
AI can potentially create a Skynet scenario. No computer should be able to have anything close to human free will
Now I'm not the "technology run amok" naysayer, but:
1. some things will need to be regulated
2. most importantly
we can no longer tolerate anti-social ideologies in the name of "freedom", it only takes 1 disgruntled man with the tech to ruin it for everyone, I never understood why we have to respect the "freedom" of people who clearly are either very reckless or very determined to disrespect ours. Freedom and tolerance work when there is mutual understanding, if not, then anything goes. Tolerating intolerance is for suckers. If someone truly hates society to such an extent they wish to see it all burn, then it's only fair that they should be invited to step out (in the woods), they were the aggressors first, we're simply defending our way of life.
All these 5th columns, weird cults etc. need to be reigned in instead of being allowed to operate freely under the guise of "freedom", enough tolerating intolerance.