That's nothing more than a cope. They believe they are acting for the greater good whilst ignoring the very real suffering they are causing. Whether it's defined as violence is immaterial to me and a semantics game.
Its not, as I said before all protests cause disruption and some cause very severe disruption, particularly the large ones in London. if people want to take this ridiculous stance that any protest which potentially causes an emergency vehicle to be delayed should be banned then virtually all protest would be banned.