As an aside, I notice there's a tag named, "tag" which is not a synonym of, "tags." I would suggest making it a synonym via the site-feature I just got as a privilege... but I can't.
Right now, there's an absurdly convoluted means of suggesting tag synonyms, for fear of an equally convoluted means of undoing them. This seems ridiculous.... When I looked for a topic like this one, I found a string of people suggesting via meta this or that tag synonym to moderators... instead of using the in-site mechanic.
From what I've read, everyone agrees it's absurd, but this is the best we can do with a poorly designed system. But... since we have to throw the tags at the moderators anyway, why not just make them part of the system?
As HDE 226868 mentioned in one topic, it's honestly too dangerous, where a few users could accidentally screw up major tags without meaning to. So, if possible, we really ought to make moderator approval necessary, since that's already the defacto system?