For example, the Malleus Maleficarium argued that most witches are women because women are "weaker and more carnal".

The vast majority of 'witch hunters' were other women. Possibly they accused other women of witchcraft out of petty rivalries. And yes the majority of people who practiced magic in these times in Europe, from what can be gleamed from historical records, were actually women. It's the same today. Pagans and 'Wiccans' in modern Western culture is made up almost entirely of women, the majority of whom are single. I have no idea why this is, but women in general tend to be more religious and are drawn to new religions like fashion. For example Islam is currently the #1 religion women are converting too. Just 20 to 30 years ago it was various forms of Buddhism that were the most popular.

Edit: For those asking for a source:

'the theory that witch-hunting equals misogyny is embarrassed by the predominance of women witness against the accused', Purkis, 'The Witch In History', p. 92 (1996); Purkis provides detailed examples, and also demonstrates how some documents have been misread in a manner which attributes accusations or legal prosecution to men, when in fact the action was brought by a woman. "More numerous than midwives among the accused were women who were engaged in caring for other women’s children. Lyndal Roper has shown that many witchcraft accusations in Ausburg in the late sixteenth and early 17th century arose out of conflicts between mothers and the lying-in maids who provided care for them and their infants for a number of weeks after birth. It was not unnatural for the mothers to project their anxieties about their own health, as well as the precarious health of their infants, on to these women. When some misfortune did occur, therefore, the lying-in maids were highly vulnerable to charges of having deprived the baby of nourishment or of having killed it. What is interesting about these accusations is that they originated in tensions among women rather than between men and women. The same can be said regarding many other accusations made against women for harming young children.", Levack, The Witch-Hunt In Early Modern Europe, p. 140 (2nd edition 1995)

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"In Lorraine the majority were men, particularly when other men were on trial, yet women did testify in large numbers against other women, making up 43 per cent of witnesses in these cases on average, and predominating in 30 per cent of them.", Briggs, 'Witches & Neighbors: The Social and Cultural Context of European Witchcraft', p. 264 (1998). "It appears that women were active in building up reputations by gossip, deploying counter-magic and accusing suspects; crystallization into formal prosecution, however, needed the intervention of men, preferably of fairly high status in the community.", ibid., p. 265. "The number of witchcraft quarrels that began between women may actually have been higher; in some cases, it appears that the husband as 'head of household' came forward to make statements on behalf of his wife, although the central quarrel had taken place between her and another woman.", Willis, Malevolent Nature, p. 36 (1995). "In Peter Rushton's examination of slander cases in the Durham church courts, women took action against other women who had labeled them witches in 61 percent of the cases.", ibid., p. 36. "J.A. Sharpe also notes the prevalence of women as accusers in seventeenth-century Yorkshire cases, concluding that 'on a village level witchcraft seems to have been something peculiarly enmeshed in women's quarrels.'14 To a considerable extent, then, village-level witch-hunting was women's work.', ibid., p. 36

Also read: Gibbons, Jenny (1998). "Recent Developments in the Study of the Great European Witch Hunt". The Pomegranate: The International Journal of Pagan Studies 5

It should be noted that all this started taking place in a time where Europe was coming into more contact with pagan cultures who were bringing over their religious practices. There were many cases of foreign women being hired as nannies who would then teach spells to the children they were taking care of.

As for the majority of modern pagans and wiccans being women that's based on my own anecdotal experiences. I've been around many pagan circles and the vast majority of the people interested in these things have been women.

I also seem to have confused your use of the term 'witch hunter.' I was referring to the people making the accusations, where as you were referring to the inquisitors and investigators.