From my experience, writing rules directly after incidents and as a reaction to incidents do not produce good results. New members of the community 5-10 years later will have no understanding of what the rules are trying to do or why they exist, and when a new incident occur the rules get rewritten again and again. The only effect is the optics as in sending a message that "we take those concern serious", but without substance, and again from experience, those people who was leaning to leave will still leave regardless.

What has worked in communities I have been active in is to have continuously conversations, in combination with a no-blame culture that provide social safety for people to bring up issues and also room for people to improve without feeling personally attacked (which is the opposite of social safety).