Hi marine diva,
That appears to be a well done study published in a high quality journal and consistent with others that have demonstrated certain antimicrobial properties of tea tree oil in the laboratory context. It does suggest potential promise.
However, it belabors the obvious to say that it's a very a long leap from demonstrating bactericidal effect on a few specified clinical isolates in laboratory flasks to establishing efficacy in human beings with chronic suppurative infections of the feet. The history of pharmacology is littered with preparations that looked promising in culture vessels and mice, but never showed real value in trials with humans.
The Australian government did consider tea tree oil an essential for WWII armed forces' first aid kits, and it was found in the kits of American and Brisith troops as well. However, as best as I am able to determine tea tree oil was included due to a belief that it had antiseptic/antifungal properties, not because it had been proved to cure established bacterial infections.
It also should be mentioned that while the first antibiotics were prescribed in the late 1930s, it wasn't until 1941 that a form of penicillin was developed for treating bacterial infections in humans, and penicillin wasn't available for widespread use until the mid-40s. And sophisticated, large scale antibiotic research and development didn't really take off until after WWII. Tea tree oil quickly dropped out of military first aid kits once effective antibiotics became widely available.
That you don't feel you need a study to tell you if a medication works is entirely your prerogative. Others may wish to be more circumspect before applying or ingesting substances that are as of yet of scientifically unproven usefulness in treating their condition.
Finally, to state that "... the scientific community is still out to lunch on the effectiveness of its use, it certainly does not mean it does not work" strikes me as derogatory. I suggest that a more accurate representation of the matter is that the scientific community still is researching tea tree oil and the medical jury still is out on its use in humans.
Regards,
DocVikingo