Motives and honesty are joined at the hip. Honest people will be up front with their motives. A liar won't. And reputations for honesty precede the advocates of any particular proposition.
If they're proven liars why waste time on them? i. e. They don't get the benefit of the doubt.
Well, I've read the full version of their paper [link posted on this thread in # 44]. I would not be questioning their intellectual honesty.