Well, that's the point, isn't it? - you are only safe at home because your partner is not abusive. Same way I'm safe with mine but wasn't with the bastard ex ; if DP changed his mind about this for any reason, I wouldn't be. He's not much taller than me, he weighs a couple of stone less than me, he's got a shoulder injury, but I still know that one handed, he is still faster, stronger and has more stamina that I do.
It's not that they have to protect you from the entire world, it's that they choose one way or another, whether through resisting an urge, whether it's never occurred to them, whether it's because they just haven't never felt angry at you about something, not to personally be a danger to you. Because if they want to harm you, they can.
Women aren't helpless without men. But women are on the whole reliant upon men's individual natures, temperaments, socialisation, attitudes and above all, their choices to not be at risk from them.