The lone individual is not a threat. The killer in a collective with a great number of like-minded others is a threat. Then there are conversations, notes and a trail of words to identify them. That’s when they need to be identified as a terrorist organization and treated accordingly to remove them from a republic to safeguard the citizens of the republic. That is the primary duty of elected representatives.
I enjoyed these remarks from the Charlie Kirk Memorial Service:
Tulsi Gabbard
https://www.youtube.com/watch?v=YiMJ_aeg3qY
Benny Johnson
https://www.youtube.com/watch?v=1sFZksYSGXY