Why escalate the language here. When all precautions are taken not to hurt anyone this is just classical sabotage. Still too dangerous to execute, IMO, because fires are uncontrollable, but hardly terrorism. There was a case from a dutch man in 2002 who shot a conservative politician partly over animal issues, but also on general cultural issues beyond that. On the other hand hunters have killed several protesters during mass sabotage actions.

Like any social movement I don’t think vegans should let themselves be divided by the question of violence. Nobody likes it, we shouldn’t fetishize it as a movement, but situationally it probably can turn out useful and we should stand in solidarity those who endorse or use it reasonably.