Incest 

I am pleased to hear you also dislike incest. This is not a personal opinion however. In the course of my research at Oxford University I can see clearly how sickening and harmful it is. This is no more a personal opinion "the earth is flat". Does the fact that some people do believe the earth is flat make it a matter of opinion? Of course not. The harmful effects of incest are directly observable in exactly the same way. I think we need a third party opinion on this.

James Allison