I like this message, that we could choose love but we give in to fear, etc, but it seems that he means every writer has something to say that is important to be said.

IMHO that is a very optimistic take. Often it's self-serving "just write" mentality and the results are not very interesting or useful, some use writing as a thinking tool (pg comes to mind), others, most?, do it to sell something, perhaps themselves. And all this stuff that comes out that sounds good, is convincing, but misleading (aka lies or wishful thinking). And the rest is derivative or a few good (old) ideas mixed with lengthy fitting examples.

You added the "important" part - all he says is people write when they have something to say.