There's no such thing as a stupid question until you ask it too many times.
Madness string 93157
How about the two of us become monsters and really mess up this whole awful world? Until there's no more evil, no more sadness, nothing left at all. Let's just break, break, break it all to dust.
These humans were being told that they were killing the people they were charged with making healthy and whole. On top of the whole 'How dare you suggest that I, a gentleman of means, am unclean!?' combined with 'Well this other gentleman of means and several of his peers say that you are wrong,' we have the very real and sadly common human reaction of '...but I'm the helper. I can't be hurting them because I'm the one who helps.'