daasyochid: “If someone doesn’t know his parents’ yahrtzeit, he says Kaddish on a random day . Wouldn’t you agree that it helps? “
We are not talking about soldiers whose yahrzeit is unknown. On Yom Hazikaron, Kaddish is recited (and not at every ceremony; (there are several throughout the country) for ALL the fallen. This is the “official” policy of the state, which has no basis in halacha or minhag.
The Jewish way of memorializing is a much greater honor to the dead than the “official” Israeli way, which simply imitates gentile customs.