If at all possible, good activities with risks should at the very least be approached with caution and training, not outright avoided.
Taking ideas seriously is potentially harmful as ideas are possibly no good, prompting the general strategy of steering clear of ideas. The urges of asymmetric justice also pull in this direction, as application of norms, with presence of any blamable risks paralizing even when action is manifestly good in expectation.
I maybe agree? This seems pretty general, in that it can apply any side of the advice to suspect self-reported attributes. I'd rather focus on what circumstances and actions lead to criticism being effective for what goals.
It can also be good to list the positives (advantages and beautiful things) in self-criticism. It shows honesty, accountability, high standards, ...
On the other hand, we often use a double standard (harder on oneself) which can imply a sense of superiority (it'd okay for others to make mistakes, just not for us). Another downside of self-criticism is that spots that we beat down become sensitive and so we may be less receptive to feedback (being defensive).
Preface
Some people are especially virtuous. They devote their lives to making the world a better place. They do so in a considerate and effective manner to the greatest extent that any reasonable person can. They do so with a humble attitude. All together, they are excellent human beings. It helps our society when their work is appreciated. They are role models for others.
Self-critique can be a necessary and valuable part of shaping oneself into such an exemplar. It helps you identify your own biases and seek to correct them. It helps you to hold yourself accountable for your failings and do better in the future.
Clearly, some people are not exemplars. Some are even downright villains. Examples come readily to mind. They might be public figures. They might be the perpetrators of small but potent injustices who we have to deal with in our personal lives.
Most people are somewhere in between. It can be valuable for an exemplar to assume they're about average, with lots of room to grow. However, perhaps by definition, there is less to criticize about the behavior of exemplary people than of villains. And criticisms, including self-criticisms, have consequences.
If those criticisms are inaccurate, destructive, or easy to misinterpret, then they could be harmful. Even if an exemplary person is using self-criticism to prevent themselves from backsliding, it is possible to write or speak an inaccurate, destructive, and potentially harmful piece of self-criticism.
Such misguided self-criticism can be harmful to the self-critic, by inflicting emotional suffering upon themselves. It might be harmful to other people as well, in several ways.
I hope that people who suspect that they may have a low threshold for self-criticism, and for whom self-criticism has destructive effects, will reconsider this as far as they are able. I also hope that they have read this essay in a tone of self-compassion.
For those who perceive themselves to be of sound mental health and publish pieces of self-criticism, I simply hope that they will hold themselves to the same epistemic and communicative standards that they bring to their other speech and writing.