I believe that each of us have a DUTY to protect these plants[.]
Fuck the plants. The fact that many psychoactives can be found in nature is incidental (and nothing more.) It's convenient, but there isn't a difference between an "organic" molecule and a synthesized one. A molecule is a molecule.
Go read about the history of organic chemistry, what it initially was, and what it's become today.
I think your intentions are good, but you're so far off the map you're not going to do anything worthwhile for the drug culture. Your logic is completely fucked, every point you've brought up is completely fucked, and your beliefs are completely fucked.
For example:
1) Does it come directly from natural/organic botanical sources? Is it a plant?
Datura is a plant. It contains psychoactives (although its means of activity are far different from what you'd find with other hallucinogens.)
2) Does it have a long history of human use? How many years has it been in human usage?
Length of use is irrelevant to a substances safety. Completely irrelevant. Go read the difference between causation and correlation. If you don't understand what I'm talking about, go fall on a stick.
3) Does it's history of human use show that it is an effective psychoactive?
Same as #2, although this deviates even more. Where are you pulling this shit out from?
4) Does it's history of human use show that it is relatively safe and non-toxic?
Containing a definition within a definition is illogical. You're not very intelligent.
5) Is this substance completely non-addictive and/or non-habitat forming?
The only valid criteria you've listed, however because it is standalone, it isn't correct in identifying "safe" psychoactives.
I refer to entheogens as psychoactives, simply because they are one in the same. I don't particularly believe in the notion of entheogens, however. You're extremely biased in regard to unnatural and natural sources of psychedelics.
Don't argue with me. I know what kind of person you are. Everything you say will either be fullout denial, a sidestep, or indirect.