I agree with what others are saying, these are bad analogies:
In these examples only a very small percentage of the customer base of these products were affected / harmed and the errors were the result of an outside party tampering (in the case of Tylenol) or the error of a low level employee (J in the B).
Allow me to put this into perspecitive with some better examples:
Booking a cruise on a cruise ship named Titanic
Taking blimp ride on a vessle named The Hindenburg
Buying stock in a company called ENRON
Signing a service agreement with a cell phone provider called Worldcom
Opening an account with a finacnial services firm named Lehman Brothers
Hilter is a famous last name, yet many of his blood relatives have gone as far as to change their surnames to get away from the noteriety
Just because something is a famous mark it doesn't always translate into a salvageable brand identity.
Best of luck to you.