Virtually any time an argument relies on statistics or facts, the arguer chooses statistics and facts which verify his/her claims while ignoring those which contradict or undermine his/her argument. This is human nature. It is the duty of the listener to decide whether an out-of-context number or sentence is representative of the whole story. Any argument can be made by using data selectively.

In reality, both sides of issues often have valid points, but you won't hear anyone involved in a debate saying that.