I wondered the same thing when I was first waking up. I just could not fathom how anyone with (1) enough of an education so as to be able to write a publishable article, and (2) at least some degree of conscience could take quote after quote out of context. I realize that we're not talking about one person but about whole committees, which actually makes it even worse.
I think the writers conceptualize it as a case of the end justifying the means. Remember that these writers themselves are not seeking truth or questioning the basis of their beliefs. The whole "truth" belief system is Absolutely True. So filching a quote that isn't quite what the original writer intended BUT that supports The Truth is okay, not just because it furthers the cause of Truth but because, even if the original writer didn't intend for that quote to say what it does, if, by itself, it harmonizes with Truth, then it must be True.
Whew! I need a drink.