Wikipedia:Not every IP is a vandal

Take a look at this. This is not meant to single any one user out, but this edit revert was not necessary. This was probably reverted because the editor wasn't registered; i.e., they were under an IP address. Of course, most of these are indeed vandals: a quick look at Special:RecentChanges will tell you that. But these edits are usually reverted – and usually without checking what the edit consisted of. What I'm getting at is: Not every IP is a vandal.

Recent Changes
When looking for vandalism, many search for red usernames without a second look at the blue ones, assuming that red usernames signify a new vandal or IP to punish. This is not always the case. This is a good example. Some users don't make userpages: some prominent editors include Nanonic, Serols, and Trappist the monk (an administrator). They haven't made their own userpages, but they have been here for a long time and have made lots of great edits behind the scenes. The IP 76.66.193.90 made over 1,600 constructive edits to the English Wikipedia. Other non-vandal IPs include 220.101.28.25, 24.20.69.240, 69.181.249.92, 92.12.217.145 and 47.227.95.73.

On the Scots Wikipedia, there is an IP that constantly helps us out with vandalism and other tasks like translating. He has been there for more than a year without a username and has become colloquially known as 84.135, a shortened form of the IP.

And probably most prominently and locally, right here on the English Wikipedia, 68.39.174.238 (now known as 76.117.247.55) is likely the best example of an IP editor on Wikipedia. They have been around for years, and had a request for adminship, now deleted. An inspirational user, and one without an account.

Check before you revert
So, to finish, please oh please check before you revert, as what may seem like being bold and clever may just be shoving a new user out of Wikipedia editing forever.