... Rachel Corrie [was] killed in March after she stood in front of an Israeli army bulldozer ...
Rachel Corrie died because she laid under a bulldozer. While that is a good way to kill oneself, it's not a particularly good way to stop a bulldozer. And unless there's the threat of harm, her action would hardly be considered "placing oneself in harm's way," would it?
Like so much of the Left's philosophy, this one places all the burden for right behavior on the object, not on the objector. The bulldozer driver was supposedly under some obligation to do what Rachel Corrie wanted, rather than vice versa. Physics -- in the form of a 5-ton bulldozer -- won.