I agree with the expansion of meaning, but that mean nazi resistance was terrorism. Ukraine counterstrike on the crimea bridge/russian raffineries is terrorism. I do think it is, but now i do need to qualify terrorism before using the word.
If we expand to all kind of violence, not only physical, well any new policing laws is terrorism. Laws that increase poverty are terrorism, as poverty is an economic violence exerced by the society on its most frail. Taxation is violence too. I will need to add qualifiers each time i use terrorism, and that cheapen the meaning.
[edit] my la setnence cheapened my argument and could start a new side debate that doesn't interest me, i'm removing it.