Nicky isn't saying that it's OK to do anything. She's saying that the practicalities are different when the abuser is the primary carer. I've never seen a thread regarding an abusive male partner who is the primary carer, ever.
OP's husband may well not feel like he's in continuing physical danger. OP leaving on her own, without her children, if he is the main breadwinner and not used to looking after the children, is going to cause one shitload of emotional distress to the children (who, yes, have just witnessed DV, but two wrongs don't make a right, and she doesn't have a history of being unsafe around them), is going to stop him being able to go away for business which might jeopardise his job, all sorts of things.
OP has fucked up very, very badly, and definitely needs to put distance between herself and her husband. She needs to accept that he might not want to continue the relationship, and she might need to leave the house while he processes the next step. Absolutely. But they have very very young children, who statistically speaking are probably used to having their mother care for them while their Dad works, and to throw all of that up in the air unilaterally, especially if the DH doesn't feel like he's in danger, might just make everything worse.
Like: hi, your wife has just assaulted you! Now, please cancel your important business trip and assume full time care giving for your young and confused children!