McGrath, you are currently experiencing the essence of the Rule called Righteous Liberal Outrage, or Godly Political Correctness, here in the good ol USA. This rule states that certain questions are not matters of opinion to be discussed from opposing points of view, but are established truths only to be denied by the evil and ignorant. You cannot have a reasonable discussion once the rule has been applied, and certainly can't hope to win an argument once it has been invoked.