While I do understand your concerns regarding a lock, and the clarity of the reason may be a bit off, you are free to ask them for further reasoning and they should give you an honest answer. I understand that some locks may be unfair at times, but this is an issue to raise either to the staff member who locked the thread, or to staff feedback.
For the request for Winston Churchill skins to be banned, we simply cannot ban people for it. Yes, Churchill may have killed people, but you can
not compare him to someone like Hitler, who killed people out of prejudice.
For feedback, moderators are able to forward suggestions to other staff members and management, and obviously you guys are notified by this too, when we give the thread an “escalated” tag, as well as some feedback. We tend to get responses from people on the staff team, and management will probably take a look at the suggestion - even if they do not respond to it, there’s still that exposure to them. I can assure you, though, that management are trying to take suggestions under their wing and fit them where possible.
If you have further concerns regarding a staff member’s actions, then staff feedback is your place to go. Hope this cleared things up a bit. :)