There are only people who initiate force, and everyone else.
The only people who initiate force who would possibly cause terror in me are those I can't adequately resist.
The only ones I would ever feel inadequate against are those who have State permission to initiate force against me. The inadequacy comes from my recognition that they have a lot more money than me (since they can steal or print "money" without constraint), and with that money can buy lots of fancy hardware and the cooperation and "loyalty" of a lot of principle-impaired people to keep sending after me.
So, I suppose that to me, the only possible "terrorist" would be a State employee. IF that employee were able to instill terror in me, which is unlikely.