Being a bit older than you, I was probably more aware of who was doing & saying & writing what and when. And I don't think that you were faced with this crap, on a regular basis, as I was. If I'm wrong/mistaken, I'm sure you'll tell me. :-)
Horowitz had nothing to do with the Greenwich Village bombing and was long gone from New York by the 60s - in London and Berkeley by then. The thing about Horowitz - like Jane Fonda - is that both of them were in their 30s by the radical 60s when all the rest were “kids”.