There have been plenty of extremely well organised, sophisticated and technically competent terrorists. The IRA, the Red Amy Faction, the PLO and Black September, Al Qaeda.
Aside from 9/11 none of them have operated successfully in the US and your domestic terrorism has mainly been perpetrated by individuals or very small one off groups of just 2 or 3.
Aside from 9/11 none of them have operated successfully in the US and your domestic terrorism has mainly been perpetrated by individuals or very small one off groups of just 2 or 3.