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For what it is worth, I think the second position is much more compatible with the study of the history of science than the first position: it allows more room for error, improvement, and evolution, without reducing the possibility of science being a means to reliable knowledge.
Which is why I say that most of these things are not "really" postmodern in the way people tend to read them. There are perfectly respectable epistemic positions that do not require science to be "pure" to be useful and "true" in a qualified sense ("it fits our evidence so far").
As for whether this approach is more actionable — I actually believe it is, and I say this as someone who is something of a science communicator and is, indeed, trying to engage in real world issues. But that's a longer Tweet-storm than I suspect anyone wants to read. 
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