"Sure they can, but I'm sure that it just gets tiresome for them when there are new similar threads being posted all the time. People just wish that some of the anti-catholic crowd would just take the time to do some research from other more objective sources before posting so much factually false material. What they are doing here is the equivalent of going to the Daily Koz for their "facts" on President Bush. We simply expect better from people posting on a conservative site."
It's a narrow analogy limited to the topic at hand. ;-)
However, as you know even the most devout among us can be led astray by temptation, sometimes, for example, under the lingering belief that the end justifies the means. Perhaps McArthur, in sincerity believes that a little white lie about catholicism that will lead someone to find what McArthur believes is "biblical truth" and this leads to their salvation, then perhaps this white lie is better than leaving them under the "false doctrines of papism", or something like that. (I am only guessing, and am trying to give the man the benefit of the doubt.)