I dissagree with the letter writer, here are a few points:
One of my Roshei Yeshivos just finished giving a shmooze about bochurim coming on time to davening, and I asked him that the vast majority of the bochurim come on time, and the minority that doesn’t won’t start any time soon (this was when I was older, not a young high schooler afraid of getting yelled at), so why bother? He told me that when something is wrong, it is bad for our ruchnius to stand by and let it go. By being passive to other’s improper behavior, we are letting ourselves get affected by it. Therefore, he concluded, he wasn’t giving the shmooze just so the bochurim would change the way they act, but rather for himself; so such improper behavior shouldn’t be something that he got used to and tolerated.
Also, I think the letter writer is fundamentally wrong about people not listening when they are criticized or getting yelled at. Firstly, on an internet forum it is easier to see that actions are attacked and not people- you know that a criticism is not aimed at you personally, because no one knows who you are. Further more, some people benefit by having something pointed out to them. If they are not defensive, they may see something as something they overlooked and didn’t realize. I know this may be a minority, but it still serves a good purpose for someone who wants to improve something that he/she wasn’t aware of previously. Most of us mature adults can see the validity of the points people make regardless of their tone, or CAPS.
Finally, to decry Kol Kories and the sort is decrying the Gedolim who sign them. I acknowledge that there are impostors, who somehow get non sanctioned signatures to appear on their own personal vendetta posters, but the attitude of the letter writer seems to be that everyone should just act their best, and it’s no one’s right to tell others what to do. We are submissive to our Gedolim, and if they indeed “tell us what to do”, or actually sign a Kol Korie with a directive that may be a change to our personal behavior, then you either acknowledge your submissiveness, or you truly think you know better, which I believe is a sad predicament.