You know the funny thing about those terrorist violence stats is that a lot of them seemed to cut off around 1974. I noticed that a few years ago. Then I did some digging and it turns out that the cutoff just magically happens to be "just right" for excluding a lot of far-left Weather Underground bombings.
The thumb has been on the scale to discount violence like the Berkley Bike Lock basher. Or, wasn't there a right wing figure punched, sans provocation, right there on video, and the judge threw that one out? I don't track those guys so I don't recall the name, but I do recall the outcome.
The cutoff for the article i linked is 2001, not 1974. It is also of killings so wouldn't include the Weather Underground anyway, neither would the other examples you give. I also don't think it is particularly relevant if far left violence was higher in 1973 because that was 50 years ago and lots of things have changed.
The fact of the matter is that today the far right commits much much higher levels of violence then the far left, if you have specific statistics that are different from that, not just some random anecdotes, please supply them.
Edit: And to be clear, Far Right groups are responsible for over half of the terrorist deaths in the US, with Jihadist groups being number 2: https://www.newamerica.org/future-security/reports/terrorism...