Americans are not comfortable with friendly fire deaths involving children. The Israelis are a bit more lenient in that regard.
If the gunmen has been aware that there were armed people in the building, they may have deterred by that. The Virginia Tech gunman checked the classrooms for badges before he started shotting.
“The Israelis are a bit more lenient in that regard.”
And Palestinians and Muslims are even MORE lenient than the Israelis - hard to believe, isn’t it?!?