It's useful, in how anti-science nutters like Kosh are willing to instantly identify themselves as such. Once you see some cult bedwetter whining about how global warming is a fraud, you know instantly everything they say should be assumed to be a lie, unless independent evidence shows otherwise.
Some nice strawmen on the OP's list. I've never encountered any of these people listed below. I suppose since actual anti-science positions held by liberals are in short supply, some had to be manufactured.
fetal life deniers,
"sex has nothing to do with reproduction" people
"evolutionary psychology is sexist" people
Anti-science positions are scarce among liberals because liberals are willing to tear their own whenever a liberal utters such stupidity. We ripped into the anti-vaxxers, we ripped the anti-GMO kooks, so they've been moving to the more conspiracy-friendly conservative side. Conservatives may not criticize fellow conservatives, no matter how crazy the conspiracy theory.