Prayer And Unity

In Parashas Korach, Moshe Rabbeinu announced that the events that were about to unfold would establish clearly whether or not Korach was right in his challenge. “Through this shall you know that Hashem has sent me to perform all these acts, for it was not from my heart. If these die like the death of all men, and ‘pekudas kol ha’adam yepakeid aleihem,’ then it is not Hashem Who has sent me” (16:28–29).
What is the meaning of the phrase “pekudas kol ha’adam yepakeid aleihem”? The simple meaning is “the destiny of all men is visited upon them.” However, the Gemara in Nedarim (39b) says that from this pasuk there is a hint to bikur cholim. Rashi explains the hint is from these very same words. “If these die like the death of all men, and are visited with normal bikur cholim visits, then it is not Hashem Who sent me.”
Why would Moshe Rabbeinu specifically mention bikur cholim now? Based upon the Kli Yakar, it appears that Moshe Rabbeinu was saying that if these men (Korach and his followers) merit having the mitzvah of bikur cholim performed because of them, then they must be righteous and are therefore correct in their argument. Why would this indicate that they are righteous? Hashem brings about merit through righteous people. So, if Hashem allowed these 250-plus people to become deathly ill and generate many bikur cholim visits, then it must be that they are righteous.