That's how I always felt about Ben's reaction. That life is precious, but I don't think that taking of a life (in the interest of good) should in anyway inhibit a Jedi from action. I know that's not what you're saying, but that's what that could lead to. Jedi, for me, are made for action and shouldn't be resorted to a complete 'do nothing' just because he feels pain everytime he strikes an enemy down. I think Ben only felt that pain because it was a massive number of people, but when it's just one or two at time, it shouldn't be extreme. If it's a loved one, and it has more emotional impact, then maybe it'd be more sharper, which is why an emotional connection would be discouraged?

Although, I really wish that hadn't been established in the PT, that making connections should be discouraged. Really didn't work for me.