From your link:Sicarii: First Century Terrorists
And, the zealots didn't just kill "politically active figures." They killed civilians.
"Although they were not terrorists in the modern sense"
And yes, they have indeed killed politically active figures, not simply your daily innocent.
Read your own article, it clearly states their target and would enrich your knowledge on them by far.
Now, to the actual reason why I've called your opinion a naive one - is because it was claiming that the Zealots, the organization that - as your own article states - opposed the Romans in the land, and has targeted Roman political and military officials - was the first sign of terrorism to exist in the entire of humanity.
That is very naive because even if we do consider the act of guerrilla warfare assassinations as terrorism, the Zealots did certainly not come before the Romans themselves, who have slaughtered entire villages when they have conquered them.
Or perhaps the Persian empire, the Babylonian and Assyrian empire, and every actual military force that has existed in ancient times.
There is no doubt here that this argument has no water to stand by, and it would be more effective to argue that the sun is made out of German poop.