Follow-up to: What have you recently tried, and failed at?

Related-to: Challenging the Difficult Sequence

ialdabaoth's post about blockdownvoting and its threads have prompted me to keep an eye on controversial topics and community norms on LessWrong. I noticed some things.

I was motivated: My own postings are also sometimes controversial. I know beforehand which might be (this one possibly). Why do I post them nonetheless? Do I want to wreak havoc? Or do I want to foster productive discussion of unresolved but polarized questions? Or do I want to call in question some point the community may have a blind spot on or possibly has taken something for granted too early.