There are no circumstances in which you are better off voluntarily speaking to the FBI without a lawyer. None. Don't be polite and chat. It could ruin you.
ICE observers in Minneapolis have begun receiving visits from FBI agents sent to intimidate them. A close friend-combat vet, mother, no criminal record-who was a volunteer observer during the ICE crisis, had a visit and was threatened for taking photos and videoed, claiming that filming was illegal.