Sometimes resistance groups do terrorist act it doesn't strip them the title of resistance Like the anc is south africa was responsible of killing certain civilians , mandela was called a terrorist. In india , there is a leader named nana sahib who intrntionally murdered british civilians and soldiers which he promised to set them free. Would you have asked that groupc to disarm before the end of british occupation. Even jews was planning to poison water suply that would have killed civilians. Do you think if they executed the plan, they wouldn't have the right to resist the holocust?