Biden won't make it out of 2021 alive.
Too much baggage to kept swept under the rug?
Too volatile and might run his mouth letting people know they're up to fuckery that ruins/slows a plan or 2 down?
No problem, let's just give him some natural causes and let Harris have it asap.
She'll do as told while being less of a risk to fuck it all up.
Plus she's not a white guy so she can't be criticized as hard.