Small yes I didn’t say not large enough to sway an election, which is the point this entire thread has been making.
Elections have consequences and we have been living the reality of 2008 and 2012 where the small minority chose to vote poorly or not vote at all.
You originally said "small" and "unmovable." It appears the "small" word turns out to be not so small as to be unimportant.
If you honestly believe this cohort is unmovable, then the rational reaction would be to abandon effort there, and look elsewhere for support.
IIRC, you are the one who said you consider this cohort of voters to be "enemy" or worse, so you don't want them in your camp anyway.