Because abrasive conversation leads to rapid breakdown of conversation, and further breakdown of trust.
What I can say is that forums like Peaceful Science, where there is less ridicule but more diplomacy yet honesty in exchanging views, are very rare. Whereas pro-atheist forums with ridicule are more common. Perhaps it’s time to try a new approach instead of trying to keep doing what we know is not effective.
Secondly, we should also play the long game. Josh probably will make people from YEC families more likely to accept evolution in the future through his talking at creationist conferences. Converting old people with entrenched views is much harder than converting young people who are undecided or trying to make up their minds.
The video you shared is from 2008. Did the New Atheist attitude work? Is religious discourse no longer acceptable in the public sphere? It seems to me that the anti-vax movement got bigger after 2008…
New Atheism is mostly dead. Its chief proponents have either morphed into something else (e.g. Sam Harris), or stopped altogether. Quoting PZ Myers:
It seems to me that the anti-vax movement got bigger after 2008…