Imhotep says : "You must assume rain is wet, could it be red, blue or colorless, until proven otherwise." https://twitter.com/imhotep256/status/1260945790199050241

That way the field you just watered, thinking the red rain won't water it, will flourish, instead of being drowned.

That's a strange analogy, few will get this.
When you don't know the rain (Disease), why try to frontrun it (vaccine) ?

"But Imhotep, what if the red rain isn't wet ?" they'll say.
"Then, only once it has been proven, should you water your field" I would say.

* Red rain falling off the sky,
Wet rain, watering your eye *

This thread could only be understood by a <100 or >150 IQ.
No in-between.