Why is it always "cure of cancer". There's so many better achievements. USSR was in a horrible state without Stalin anyway back then to provide good research equipment to anyone neither was medicine a well developed field in the world. Which is something very obvious due to the extent of the Spanish flu 20 ish years back.
You say that the death of those 2500 has influenced history magnificently.
In the case of society's development you are overvaluing the butterfly effect.