Just as I write this, a user with $\sim$500 rep. has retagged 28 questions inactive by removing the tag [differential-equations](https://math.stackexchange.com/questions/tagged/differential-equations "show questions tagged 'differential-equations'") to leave only the tag [pde](https://math.stackexchange.com/questions/tagged/pde "show questions tagged 'pde'"). This has crowded the main page with already answered questions, and I find this very unnecessary and nocive for actually active questions. Aren't there any regulation as to editing *that many* questions , some as old as *November '10*? Shouldn't they be moderated by high rep users before getting bumped up? Is there any way this can be avoided in the future?

**ADD** 31 by now.

**ADD** Some examples of the edits. Red means removal; green addition. Black means unchanged.

1. [analysis] $\color{red}{\rm [differential-equations]}$ $\color{green}{\rm [pde]}$
2. $\color{red}{\rm [differential-equations]}$ $\color{green}{\rm [pde]}$ [numerical-methods]
3. $\color{red}{\rm [differential-equations]}$ $\color{green}{\rm [pde]}$
4. $\color{red}{\rm [differential-equations]}$ $\color{green}{\rm [pde]}$
5. [soft-question] [terminology] $\color{red}{\rm [differential-equations]}$ $\color{green}{\rm [pde]}$