"Basically, saying "both sides do it" is a form of trolling. In almost every case, when a Very Serious Person says "both sides do it," "both sides are to blame" or any of its variants, it is to shut down discussion, not to bring it to a deeper, more nuanced level. (There are exceptions, but they are few. We'll delve into this further in future posts.) Obsessing about "tone" and other cosmetics serves the same function. 'Sensible Centrism' is very popular because it gives the appearance of wisdom, objectivity, independence, impartiality and so on without having to commit to much of anything."
Continuing on a theme: