The term aggressor is misplaced. The data shows how men as a general rule always play the antagonist and the disposable henchmen. The mustache-twirling, eye-rolling, leering, cackling, and hand-rubbing villain is by definition male, and in the rare occasion a plot is different and switches the gender of the antagonist it also adds additional changes like poison and stabbing instead of guns and punching.
The wicked witch trope is named after the wicked witch of the west character, which don't do much leering or hand rubbing. There is a lot of cackling, possible some eye-rolling, but that's about it. An other famous witch villain is the white witch (Narnia), which has none of those attributes.
But lets look at a famous villain that has been portrait as both female and male roles and see how they differ. Moriarty is male in the TV show Sherlock (https://www.youtube.com/watch?v=YN7DYPJLXkc), and female in Elementary (https://www.youtube.com/watch?v=lY7i8cQontg). Which character is show more as the typical villain, and which is portrait as more complex with redeeming values? If they keep the script identical with the exact same lines, what would happened if the genders was reversed for the two shows?
The wicked witch trope is named after the wicked witch of the west character
Yes, but the actual details of the trope go back much farther in time. The Fates of Norse and Greek mythology, the Three Witches in Macbeth, Baba Yaga from Slavic folklore. There is a long, long tradition of female characters with supernatural power, unsettling appearance and behaviour, and a tendency toward transgressing taboos such as cannibalism.
As for your Moriarty example, you're butting up against the TV industry's insistence on casting beautiful actresses in almost every role. This is a problem! If you replaced Natalie Dormer with a woman in her late 70s who's never had plastic surgeries you'd have a different comparison to think about.
The villain as plotted in current shows share roots in the older mystic stories but they also mirror current cultural values rather than past cultural values.
If for example we would have Hansel and Gretel, which is full of old symbolism about past cultural views of older women, it would be completely impossible to gender swap the antagonist. Interpreting a male antagonist in that story in current culture we would invoking feelings of pedophilia and not cannibalism, changing the story in a very radical way.
With current cultural values, stories generally cast female antagonists with a strong theme of betrayal. Even in the few cases of female henchmen like that one specific James Bond movie with female henchmen, we still see that arc. Male henchmen in other movies don't get such arcs, and is generally simply thrown in as an obstacle to be disposed of. Female henchmen are also generally not killed, which further limits the possibilities.
Last, the Sherlock version would not work with a late 70 old woman if they kept all other aspect of the character intact. Listen on the clip and try to imagine a old woman saying it. The character explicitly say they want to be seen as the classic villain, and as such it do not work unless its male. Even the wicked witch do not go around and say to the protagonist that "I am the villain and you should hate me".
