I want to support my sister in her divorce, but the manosphere tells me she is avoiding accountability?

My sister's husband has been physically abusive, and she is divorcing him. I went to my usual online haunts (as we do), looking for advice. I'm primarily active in the manosphere, which generally tells me that my sister is reneging on "till death do us part", that men do not physically abuse their wives without prompting, and that my sister is displaying a lack of accountability for her role in the marriage breakdown.

I was initially taken aback by what I thought was a lack of empathy for an abused woman, but it did give me pause for thought. Could rushing to my sister's defence be misguided? Could she, as someone who lives life on easy mode by virtue of her sex, be shunning accountability in the collapse of her marriage? I was furious with my brother in law for striking my sister, but I'm now challenged to examine the possibility that he was driven to it by an unappreciative, overbearing spouse.