Of course ignorance drives science in this respect. Scientists operate by saying "We don't know this, let's find out" (ignorance). Of course as soon as one thing is discovered it points to more things that need to be discovered, so "ignorance" in this form is never eliminated and it does drive more work.
However, "professed ignorance", "studied ignorance" or "willful ignorance" are equivalent to stupidity and are the responsibility of the professed, studied or willfully stupid individual.
No one can know everything, so we choose what we care to pursue and what we care to leave behind. If you leave behind evolution (for these threads) and science in general, that's OK, but you cannot make informed comments and judgments from a position of ignorance. It just makes you look silly (at best) or stupid (at worst).
The only impediment to learning is a person who refuses to learn.
As, for example, when a dogmatic evolutionist rejects ID out of hand and declares it unworthy of discussion in a classroom before studying and comprehending all it entails.
Science is futile. if you're never going to have The Answer what's the point?
OTOH If you bave The Answer, what's the point?
The Gripping Hand. Closure is overrated.