Because getting your freewill taken away by being killed by someone else ISN'T respecting freewill. Or rather it is, but only the freewill of those who take away the freewill of others. Why would anyone run a universe like that? God could easily intervene in those cases where someone's freewill is endangered. But he doesn't. And that's not justice. That's promoting only the power of a few a-holes to take away the freewill of many others. Might as well live in a universe ruled by random chance. At least then there'd be noone to blame.