It was largely over by the late 60's. Did you ever listen on the ham bands between about 1963 and 1966, particularly on 75m?
I was on AM between mid 1960 and 1966,--had a Viking II, and a DX-100
and a Globe King in 1966.
I did get on 75 meters, but my favorite bands were 40 and 20 back then.
I do remember W2OY,--most guys did "steer away" from him as I recall.
In 67, I was out West working for Boeing in Seattle,--and from 68 through
70, I was working in Colorado for HP, and only got on 20 meter sideband,
once in a while.
After that,--I came back to Vt, met my XYL, and did mostly qrp cw work,
until 95 when I found an old DX-40 and got back on AM.
So,--I may have very well missed most of the "mayhem" during those years on 75,
as 75 was not my favorite band, and still is not even nowadays.
73, K1MVP
P.S, sounds like I did not miss much on 75 back then, although I do know many
friends(hams) who also do not care about 75, to this day.