I wrote and edited military manuals for many years, taught high school English for six years, and then instructed college English a total of 17 years.
I enthusiastically support a forum here to answer spelling, punctuation, and grammar questions.
However, I do not support gratuitous (unrequested) criticism of members' spelling, punctualtion, or grammar.
Once in a while, I might need clarification if a question or statement is ambiguously worded, and I'm guilty of putting it to some smarmy so-called expert whose "teaching" is a half-bubble off plumb.
But unsolicited sniping is seldom helpful--nor is it meant to be help. It's often just one-upmanship, and many times it's wrong enough to damage more than help.