Glitch, bug, am I a fool? (Wasteland 2)

Eric Tydeman (the doctor in the Citadel) is my character's enemy. What could be the reason? Did you not give painkillers in time?) The first time he was slammed - the whole Citadel was aggroed ... During further murders, the other people did not aggravate, but I am afraid that this type may be needed in the future. I got him an antidote, I thought he’d come to his senses ... He doesn’t want to, you bastard, he attacks anyway. What could I have done to make this NPC so angry with my characters? Or is it a bug. From what moment of the game this happened, you no longer understand (saves are saved).
Can you do without this character? If I kill him, the quest associated with him ends with the text - "Eric Tydeman is killed".