Ordinary skepticism

Skepticism holds that some set of claims is unknown or unknowable. I'll draw a rough distinction between philosophical skepticism and ordinary skepticism. Generally, philosophical skepticism operates against a broad set of claims, and leaves open the question of knowing anything at all. On the other hand, ordinary skepticism applies to a more narrow domain such as metaphysics, theology, or non-empirical science. It assumes that we already know something.[1]

At the philosophical level, the debate is anything but settled over what constitutes knowledge, and more interestingly how beliefs are justified. On the other hand, the ordinary skeptic speaks from an epistemological framework to which he is already committed. Thus, if something is not known (let's fold knowledge and justification together for now): it doesn't measure up to whatever standard his framework demands. Likewise, if something is unknowable: it is outside of the bounds of his framework.

So if a skeptic says, "skepticism is the default position," we might simply grant it. Why? Because it doesn't immediately pose a threat to anyone but the skeptic, should he wish to acquire a new belief.  What he really intends to say is, "given my epistemology, skepticism is the default position." It seems at least three types of response are possible:

1. Yes, but granted my epistemology, skepticism is not the default position
2. Actually no, your epistemology does not grant that position [2]
3. I can fulfill your epistemic requirements and thus persuade you to repeal your skepticism

[1] http://plato.stanford.edu/entries/skepticism/
[2] The first and second responses might involve some specific claim (aliens exist) or a branch of claims (supernatural events)