> So you would rather have a few incidents like what happened in France?
How much planning did they need to do online for two brothers to walk into an office with a couple rifles? Just what online snooping could have prevented that?
If they had been dumb enough to send messages online regarding their plans, it wouldn't look like
"Terrorist Leader sends you Allah's greetings! You Terrorist Brothers are to meet Lefty at corner of Trois and Main at 1:30PM Wednesday for purchase of Terrorist Rifles. Then, on Thursday at 10:30AM take them to the Target Infidel Newspaper Office at 123 Napoleon Blvd and perform Terrorist Attack on the Infidels."
so much as it would look like: "Meeting with Charlie at 10:30, Thursday. Don't be late, and bring snacks."
No amount of online surveillance will make that look like something they need to take action on.