If Eliezer was struck by a cosmic ray tomorrow and became a serial killer, me, you, and Eliezer would all agree that this doesn't make being a serial killer right.

Eliezer's positions from several years ago seem very different when compared to his positions now. It's not being a serial killer, and I rather doubt any cosmic rays were involved in the process, but what you've suggest seems to have already occurred: a relatively sudden change in attitudes and a wholesale, enthusiastic adoption of the new attitude.