Curiosity, do you believe that Hashem gives parnassa? If so why do you work or seek some other form of income. In fact, it is not universally agreed that a person cannot be killed before his time. See Or haChaim haKadosh on Bereisheet 37:21. See also Mishlei 13:23.
DY, I don’t believe that Rav Moshe said that. He certainly knew that in Israel it is permitted and fairly common. He also certainly knew that some people need them for self-defense.