Don't be so dismissive, the FBI has also considered this possibility - from the Wikipedia article [0]:

> On May 19, 2011, the FBI requested DNA samples from "Unabomber" Ted Kaczynski in connection to the Tylenol murders. Kaczynski denied having ever possessed potassium cyanide. The first four Unabomber crimes happened in Chicago and its suburbs from 1978 to 1980, and Kaczynski's parents had a suburban Chicago home in Lombard, Illinois, in 1982, where he stayed occasionally.

[0] https://en.wikipedia.org/wiki/Chicago_Tylenol_murders

It was mean to be a lighthearted joke more than dismissive, apologies. Very interesting though