Warlock used to mean “one who breaks an oath” (a charge first leveled in the 14th century by Christian authorities, so consider the source) but that hasn’t been its’ definition for over 500 years. Consider also that in places such as Scotland, the word has simply meant “a male witch” for five centuries. So, what we have in the face of those who still insist on using the word’s oath-breaking connotations, is the knowledge that they are engaging in an etymological fallacy.