Personally I do no believe anyone needs instructions on how to drive a vehicle into people. All they need is a working vehicle, a location where folks are assembled, and no respect for life. Any moron can pull this off, which makes it extremely scary.
Hmm, can anyone recall this occurring with such frequency before 9/11/2001? Which was prior to Patriot Act I & II and prior to importing pissed off refugees from predominantly muslim nations into our country. Guess which religious followers are most likely to become radicalized with hate towards American principals. It sure as heck isn't the minority religions of the world.
All this NSA spying and data collection doesn't seem to be working out very well from what I can tell. Are we going to continue to let pissed off refugees migrate into this country? Oh that's right, we need them here to push someone's agenda. Sorry, forgive me for my momentary lapse of reason.