If you try to cut down the border fence, climb over it or try to cross it in any way, and you get killed in the process, it is your own goddamn fault.
While I'd rather the IDF used non-lethal methods to push people away from the fence, I can also understand the use of live ammo. Breaching the border is not non-violence. The so-called Palestinian refugees will never be able to exercise their mythical right of return by force.
And by the way, I'm not denying there are Palestinian refugees, or that the question of what happens with the Palestinian diaspora is not a problem that has to be solved. However, most of these protesters are not refugees according to the standards set for all refugees who are not Palestinians.