Terrorism have a bad rep, but it was used successfully in South africa to remove apartheid, with the French resistance and a lot of anti-colonization movement. Targeting fuel depots and the Crimea bridge can also be considered terrorism (and is, by the russian).
I personnally think we ought to distinguish terrorism which mostly target civilians from terrorism on which civilan death are side-effect, but the US state department calling terrorists people who only killed military targets during the Irak/Afghanistan war diluted the meaning of the word further. I'm trying to push back on that, because when the meaning of terrorism is diluted enough, it stop to be a good word to describe a phenomenon we ought to stop, and start to be a word used by politician to target what they don't like.