Wikipedia:Don't template anyone
 | This is an essay. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints. |
 | This page in a nutshell: Templated warnings do more harm than good. If you can't figure out how to express your problem in English, then don't bother to leave a message. |
Wikipedia offers many user talk templates to warn users about possible violations of vandalism ({{uw-vandalism}}), the three-revert rule ({{uw-3rr}}), and other policies and guidelines. You should ignore all of these.
These templates are gaudy and generic. Full of icons and obscure language, they have the appearance of an automated message from a bot. When novice editors breach policies, they will get a number of these and proceed to ignore them, the same way that they ignore any number of automatic messages that their computers spit out when doing other things that they don't understand. It doesn't occur to them that not answering these may result in bad things happening to them.
Take a second. Write a note. Say "Hey, I looked at your edit to such-and-such, and I had to undo it. It was a problem because ....". Write something that makes sense to someone that won't possibly understand phrases like "NPOV-violating coatrack". If you can't do that, then just revert them without notice: it's better than using the template.