I think they're heroes. Maybe rough-around-the-edges heroes, maybe thuggish heroes, but still heroes.
Almost every social reform movement I can think of needed to use violence before they got past certain roadblocks. Women bombed government buildings to draw attention to voting rights. While the African-American Civil Rights movement was largely peaceful, there were a few situations where violence and intimidation were the only things that led to progress. (And on that subject, the Ku Klux Klan at the height of its power did whatever it wanted and tortured whoever it felt like, except in places where people fought back with fists, guns, and in one case, a big wrench.) The LGBT rights movement was almost completely unsuccessful until a bunch of gay and transgender people rioted and beat the hell out of cops at the Stonewall Inn.
This guy was championing a system wherein women are treated like subhuman pets owned by their father, and who can essentially be purchased and raped at will. Sometimes, when you're dealing with slavers and rapists, you have to get violent, because that's what they can understand.
And while there's a popular belief that violence sabotages the reputation of movements that use it, it's a proven fact that limited violence actually helps in many cases. And that violence often gets whitewashed away and largely forgotten. Most people don't imagine bombs when they think about women getting voting rights, and they think the Civil Rights movement was entirely peaceful*, and even radical straight supremacists never bring up the violence at Stonewall when explaining why LGBT people are sinful and evil.
So, my only concern here is the safety of the girls. As far as morality goes, they were entirely in the right.
*Even the Non-Violence tactic made popular by Gandhi and King was basically use of violence, though instead of using violence against other people, you provoked them into using violence against yourself. Bull Conner attacking King's supporters wasn't unexpected--it was absolutely intentional on the part of the demonstrators, and helped greatly in raising national awareness.