"At some point at least one anonymous poster escalated the criticism and expressed their desire for Sierra's death, together with an image of her with a noose. The same poster had made violent sexual suggestions about her." -- http://geekfeminism.wikia.com/wiki/Kathy_Sierra_incident

I remember seeing these images personally, but it's been a long time and I wasn't able to locate them again. Likelihood that any of these people would actually buy a plane ticket and pay her a visit? Pretty low. But is that a risk you really want to take, when you know they have your home address?