Wikipedia:Not every IP is a vandal

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Shortcuts WP:IP!=VANDAL WP:NEIPIAV WP:NEIPV

This page in a nutshell: Check before you revert an IP's edit, as what may seem like being bold and clever may just be shoving a new user out of Wikipedia editing forever.

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. IPs are often reverted on sight, usually without checking what the edit consisted of. But not every IP is a vandal.