Just finished reading, nicely done!
The "Is Bonsai Cruel" question tab is not opening...
I think it would be important to add that the best bet tree species for bonsai are those that grows naturally on your zone, native ones... At least until the person learn that different kind of trees, have different kinds of needs...
If you don't want to add "What species are good for bonsai?" you can add this info into other questions like "Can you 'Bonsai' any tree?" or "What is the best Bonsai for beginners?"...
Trees are harder to kill if they suits the enviroment you live. =P