I have perused the comments here and must say I have very little to add. Then again, I have to have a minimum of 10 lines here, or this comment won't get posted. Obviously, if you have taken the time to find this film and watched it, you are intelligent enough to pick up on all the nuances that a filmmaker like Murray Lerner puts into a project like this (as the comments here reflect). With all the shortcomings of the era being shown in full detail, we still have to also admit that the music then was great, and maybe even wish that music today could be so good. Then again, you can only invent a musical language once, and the process of doing it will always be remembered more fondly than when the music continues without the same degree of innovation. The issues of the 1960s may have lost their gravitas today, but hopefully a film like Message to Love might reveal a failure of methodolgy, not of purpose, and perhaps even allow us to remember that Vietnam and the assassinations of JFK, MLK and RFK were among the most important events this country has ever faced--which might be why the music was also so timely and good. If you want some more information, I did an interview with Murray Lerner:
"Murray Lerner's Film: Message to Love: the Isle of Wight Music Festival 1970. An Interview by Gregg Wager." Doors Collectors Magazine. Ed. Kerry Humphreys. Apr.-Oct. 1997: 11-15.
It's no longer available online, but ask me about it and I might be able to get you a copy.