Dowding, don't be too shocked. There are people on this board here who say the same exact things. Killing off the muslims, the racial mix of the US (and horrified posts about how hispanics will outnumber caucasians, who some posters obviously consider the "true" americans for some reason), these and other subjects are pretty regular here.
EDIT: I'm not saying it's a problem with this board specifically, just that perhaps those viewpoints are wider spread than you'd think from watching TV, and that folks have just gotten better at keeping it to themselves most of the time.