The word is useless for describing violent acts in a meaningful way
Agree.
It is not a meaningful word
Disagree.
“Terrorism” has a clear meaning, and observing when people use it, or avoid using it, is even more meaningful, as proven by those examples.
PS: I’ve been called a “no freeloading terrorist”, a “TV remote terrorist”, and a “cleaning terrorist”. It may not tell you much about what I did, but it should convey enough meaning about what they were thinking.