If you look up controversial topics, you also have the option of looking at the discussion or edit history to get a grasp of where the disagreements are.
When I made simple, objective, anonymous contributions, they were usually also accepted.
People seem unreasonably upset with Wikipedia for reasons unclear to me. Despite all the political pressure it constantly receives, it's a great resource that has largely stuck to its mission of creating a free, verifiable, neutral encyclopedia. It's probably the best thing the web has created.
Like who? I've never met anyone who has been upset with Wikipedia. I don't suppose the vast majority of people I know ever think about Wikipedia at all. I expect some of them don't even know what Wikipedia is.
I might buy "a person I once encountered was upset with Wikipedia one time". Stranger things have happened. But as a trend across people...?
1. People usually have distinct characteristics (e.g. eyes, nose mouth arranged in a certain way), so there is rarely confusion as to whether or not something is a person. What has cast your doubt?
2. Nothing, person, computer, or otherwise is upset with Wikipedia in this thread. I suspect that, emphasized by the non-response, nothing has ever been upset with Wikipedia in any time or place. What would there be to be upset about, even if only theoretically?