Also... there´s violent crime and violent crime. Most women in for murder have murdered an abusive husband, and they felt they had no alternative. It was him or them. These women are most likely harmless to everybody else... ie men who systematically beats them. So even if they´re in for violent crime, we have no reason to treat them as if they are dangerous to other people.
A problematic argument at best. We could say the same about many male murderers. "Well, he only killed white women with blonde hair in their twenties, so if we just send him somewhere without those kind of women it should be fine."
It's also simply not true that most women in for murder or violent crime are in for things like doing something to an abusive husband; and that's in fact a rather sexist stereotype. In 1999, in the US, three out of four victims of violent female offenders were themselves female. Of those 1 in 4 female offenders who attacked men, only 35% attacked someone they were intimate with or a relative of; which while much higher than for men attacking women is clearly not a high enough number to claim that 'most women are in for murdering an abusive husband' even ignoring the fact that that 35% is only 35% out of a group that is itself only 25% of the total violent female offenders.
'Now wait a minute', you might say, 'you're talking about violent female offenders and I was talking about female *murderers* specifically, what about them?'
Nope. According to the same study, spouses represent only 28,3% of victims for female murderers (29,8 if we include ex-husbands). Which yes, is far higher than the same figure for male murders (6.8%) but by no stretch of the imagination does it count as "most".
http://www.bjs.gov/content/pub/pdf/wo.pdf