'It become pretty obvious who is downzapping'

I do not see it as obvious and that is a big part of the problem.

Whoever is doing the bulk of the downzapping of anti war posts is concealing their identity- therefore everyone who has expressed support for the war comes under suspicion of being the downzapper.

The downzapper is deliberately concealing both their identity and their motives.

This prevents us from having a fair contest of ideas on the topic- it is obstructing freedom of speech and a contest of ideas.