It depends on what your definition of terrorist is ... here is Merriam Webster's definition:
Main Entry: ter·ror·ism
Pronunciation: 'ter-&r-"i-z&m
Function: noun
: the systematic use of terror especially as a means of coercion
- ter·ror·ist/ -&r-ist / adjective or noun
- ter·ror·is·tic/ "ter-&r-'is-tik / adjective
Main Entry: ter·ror
Pronunciation: 'ter-&r
Function: noun
Etymology: Middle English, from Middle French terreur, from Latin terror, from terrEre to frighten; akin to Greek trein to be afraid, flee, tremein to tremble -- more at TREMBLE
1 : a state of intense fear
2 a : one that inspires fear
Kinda scary to think about it when you look up the definition.
But what people now-a-days typically think of when they hear "terrorist" is probably quite different ... to which JWs have few, if any, similarities.