Mani Pills and amulets definitely will heal and protect those who have faith in the originator of such items. The real protection and healing lies mostly on the part of the faithful who use them in a defensive manner and not to go into robberies and wars.
It is also believed that with blessings from this items, karma still plays a part, if your karma does not invite being shot at or falling fatally ill, then there may be no necessity to have these very precious and rare items. If you are faithful enough then blessings from the Buddhas with or without these holy items will protect to be averted or at least the fatality to be less.
Interesting to learn from these article that there are now 2 Domo Rinpoche, I only had the privilege to meet the one at Shar Gaden. During these degenerate times, it will be a blessing to have many high lamas incarnate in many beings.