Re: Stoning the pillars/walls at Hajj.
Yes people who die during Hajj will have their reward with Allah but that is no reason for not deploring unnecessary deaths. These are preventable deaths, and not seeing them as deaths that must be avoided isnt very far from supporting killing of hajis.
There is a difference between accident and murder...But, since you bring this up, the one dying from the guns of Americans will have a greater reward than those dying through an accident...
I say this because, when someone murders someone, the victim's sins are dropped upon the shoulders of the culprit making the victim free from sin as a Muslim murdered is a certain level of Shaheed...