This is just opinion, from observation, I was 10, at that point, somebody else mentioned the MLK and RFK shootings, and while these did result in a clamor for gun control,(even a couple articles in the Reader's Digest) it was a turbulent era, with Civil Rights, and Vietnam War protests, so gun control got lost, in the all general political background noise, at the time.
I was very happy with my BB guns, back then, and had no real aspirations for upgrades, and also had other hobbies and interests.