Dad is LSI and his attitude to physical confrontation is basically if confronted, you don't back down. He's been in a quite a few fights, especially when he was younger, which is somewhat incongruous with his generally bookish persona (his hobby is reading history books, sketching and carving and he's an engineer). If someone gets in your face or into your space, then you beat them down because they're disrespecting you. Physical confrontation does seem to be something that he's comfortable with and also, something which he instinctively reaches for. On the few occasions I've cried over guys, his instant response was to offer/announce that he was going to beat them up. That probably sounds hilarious, but the principle stands. When he thinks a situation isn't going anywhere and reason is useless, it is natural to him that physicality will resolve the issue. He doesn't look to fight though and he generally minds his own business, but fighting isn't something he would hesitate about or be tentative of.
I personally also fought a lot growing up. I'm not sure if it was part of my tomboy persona, or if I was just a particularly 'physical' kid. I don't fight anymore, because there aren't that many situations that call for girls to fight and the whole way in which a lot of women fight - the scratching and hair pulling - is just uncivilised and undignified. That, and I broke a girl's arm when I was 10 and I've sort of been haunted by that ever since. My attitude to confrontation was basically taught to me by my dad. Since his rule was never stand down, I never stood down. I've always been taught that if someone's picking on you, then confronting them and standing your ground, including fighting them, would get them to leave you alone. Not that I've ever experienced bullying of any kind. That said, I'm not particularly tough or physically strong and I'm probably pretty easy to manhandle.
Anyway, I do think Se-egos can be quite inclined to physical confrontation, or at least to value the ability respond to hostile situations with physicality. It's not necessarily the first resort, but I don't think it's their 'last resort' either. They seem quite comfortable with the idea of using force when they deem necessary.