It doesn't matter if it's only 2%. It matters that it's anything other than 0%.
My dad was nice some of the time and okay some of the time. And then there were the times when he yelled and raged and sometimes broke things. When he called my mum horrible names. A lot of my memories are hazy and feel like they happened to someone else as I had to dissociate from my feelings. Never knowing what mood he would be in, or what would make him angry. Always walking on eggshells. To this day, the sound of a key in the front door makes me feel panicked and my stomach churn, even now when I'm happily married to someone nice.
When I started having counselling I told the counsellor that my dad wasn't violent. And my counsellor said: I think you need to widen your definition of violence.
He didn't hit my mum, although I think I saw him push her once. Hitting was rare, but as a kid you don't think: well, I'm probably not going to be hit. You think: this adult is raging and it's scary and I don't know what they're going to do.
The memories that really hurt are not the rare times that I was hit. No, the ones that feel the worst are things like the time he called my mum a bitch on the day of her dad's funeral.
I attempted suicide at 16. I spent seven years in an abusive relationship. I've had two breakdowns. I have anxiety and ocd. I don't know who I would've been instead, if I had grown up somewhere happy and safe, not constantly waiting for the next blow-up.
I used to wish he would beat us so there was something to show for the way I felt. As a teenager I went through a phase of telling friends he did, as I didn't know verbal abuse was also abuse and I didn't know how to explain why I was scared to go home.
My parents finally separated when I was in my 20s. As other posters have mentioned, as a kid I wished they would split up. I've always found it really hard to sympathise with people who are upset that their parents separated as I was upset that mine didn't. I'm glad they finally did but full of rage and sadness that it didn't happen sooner, so that my childhood could have been better.
I don't speak to my dad at all now. I've had a hard time forgiving my mum - not because she felt she couldn't leave but because of the stupid crap she told me, like "if you love someone you don't give up on them" which resulted in me staying with my abusive ex.
And learning to take abuse and not speak up led to other situations I can't even get into.
OP, if you know that you are being abused, you have a duty to your children to remove them from that situation. They are children and they do not have a choice. You are making a choice for them and you are making the right one. It's not a choice of whether to break up a family, because that happened when the abuse started and it's already broken. The choice is whether or not your children live in a house with abuse and bullying.