It is not too late to get Bernie Dohrn for the murder of that cop in California. There is no statute of limitations on murder.
Maybe some enterprising young person at the FBI will go back and search the files on the Weather Underground cases in San Francisco. Hidden away on a dusty shelf somewhere may be a amoking gun type item that proves that Bernie was in SF when the murder occurred.
Ayers and Dohrn are not home free yet! The Mills of the Gods may grind slowly, but they grind exceedingly well.
...that should be “smoking gun”.
Hopefully the evidence has been preserved. With new technologies, they may yet see punishment for their crimes.