Airbnb is a Y Combinator company, so that is a big reason why this story is generating a lot of interest on Hacker News. It's quite on-topic for this particular community.
"People underestimate risks they willingly take and overestimate risks in situations they can’t control. When people voluntarily take a risk, they tend to underestimate it. When they have no choice but to take the risk, they tend to overestimate it."
[1] http://www.schneier.com/blog/archives/2006/11/perceived_risk_2.html