I mean...even other women accused women and girls to be witches. Everyone that was somehow different (blemishes, being too pretty, single women, widows) could be a target, but men could be targeted too. Sometimes people just wanted to get rid of someone, they were jealous or had other petty reasons. The religous panic did the rest.
You can make everything into an agenda but the "burn women with power because we can't handle strong women" thing seems as likely as the "gay people want to take over the world" theroy.
And yeah, the loosing power thing sucks...I like lesbian witches as a setting, but falling in love (sometimes it has to be a human) is a dumb rule. Witches need love, too. It would only make sense to me if they have to make a vow to only love and worship the devil / whatever magic entity they might have.