I have been contemplating the question: What is it that drives fundamentalists and pietists to attempt to enslave or else condemn other believers with their human-devised codes of behavior? -- works oriented outward superiority? The words of Paul to the Galatians came to mind:
I went up in response to a revelation. Then I laid before them (though only in a private meeting with the acknowledged leaders) the gospel that I proclaim among the Gentiles, in order to make sure that I was not running, or had not run, in vain. But even Titus, who was with me, was not compelled to be circumcised, though he was a Greek. But because of false believers secretly brought in, who slipped in to spy on the freedom we have in Christ Jesus, so that they might enslave us — we did not submit to them even for a moment, so that the truth of the gospel might always remain with you.
Galatians 2:2-5
+ pax