[pell]

> How do we, as a society, start accepting rational self-criticism again?

You might want to start with taking critique from the people you deem to be "triggered" seriously. That would be a first step in rational self-criticism. Otherwise you're selling a gut reaction as rationality to yourself. This is a common mistake people make. You might end up disagreeing with their critique - that may well be - but even then in most cases you'll likely take something from it, might be able to understand the topic at hand with some further nuance or get a deeper understanding of your position and its merits.