- Does Heidegger really think we need certainty to act?
He seems to. Leaving aside the I think frank ludicrousness of the demand, suppose that it's true, and that this stymies Marxism, because as soon as our (certain) philosophising changes it becomes uncertain, and action impossible.
- Are there alternative forms of sure thinking in which the criteria for "certainty" is lower, so that the knowledge is more ambiguous?
I was thinking of certainty in which the flip side of its equivocal meaning is assumed to be redundant. And this seems to me to be the case in passive moral reasoning: my own values change as I realise them cognitively; but that doesn't mean that I have no knowledge about what these are. I must articulate them with another.