The unsolvable question seems to be; why do you keep confusing the concept in Thelema of 'True Will' (the thread topic) with other concepts of will ... free will ... or whatever , when that repeatedly and clearly is pointed out to you.
Also I note that you acknowledge some responsibility in that ; " An often heard new age statement in my younger years was: there is no evil, because everything is Unity. Full of this credo, I have fallen in some horrific traps, which have ruined the rest of my life."
1. Well, that was your issue, Thelema does not advocate that ' there is no evil, because everything is Unity.'
In many places I have posted reference to what evil is considered in Thelema as well as giving my personal philosophical opinions on it as a Thelemite.
2. It is also your issue "which have ruined the rest of my life." This does not need to be so and again there are references in Thelema and my personal opinion as a Thelemite which suggest the rest of your life may be improved and actually you may come to shine as a star in your own orbit ... and exist in harmony with other stars;
“Thus we balance the Triads, uniting the Three in One; thus we gather up all the threads of human passion and interest, and weave them into an harmonious tapestry, subtly and diligently with great art, that our Order may seem an ornament even to the Stars that are in the Heavens at Night. In our rainbow-coloured texture we set forth the glory of the whole Universe— See thou to it, brother Magician, that thine own thread be strong, and pure, and of a colour brilliant in itself, yet ready to mingle in all beauty with those of thy brethren!”
Also this :
http://hermetic.com/crowley/libers/lib30.html
Good luck with realising your life may not be ruined … I wish you well.