What convinced you to start adding alt text to images you post online?
If you have a fediverse account, you can quote this note from your own instance. Search https://stefanbohacek.online/users/stefan/statuses/113623004004461223 on your instance and quote it. (Note that quoting is not supported in Mastodon.)
@scottjenson I generally agree with the sentiment here, I'd just add that the appropriate use of CWs should be clearly stated in the server rules, and posts breaking them should be reported to the server's admin to handle, rather than a bunch of people from different servers forming a perhaps well-meaning mob and repeating the same message.
Have you seen this poll, by the way?
https://stefanbohacek.online/@stefan/113623004004461223
Nicely shows how leading by example works best!