Sounds like blaming the neem for whatever other garbage was in or on the plant. People used neem as medicine for thousands of years.
Neem History
The history of neem tree can be traced back to the ancient Harappa and Mohenjo-Daro civilizations in India. The medical practitioners of that period studied a variety of natural occurring plants and trees having therapeutic value and neem tree was one of them. The earliest indication of neem tree being used for its medicinal properties in households began nearly 5000 years ago. Neem is said to have been widely used in traditional systems of medicine like Ayurveda and this is also mentioned in earliest Indian scriptures of medicine- the Charak Samhita and Sushruta Samhita.
Neem was earlier used in households for giving bath to newly born infants, protect people from insect bites and also indigenously used to protect a number of plants as neem contained insecticidal properties. It was also widely used to cure skin ailments.
Gradually the fame of this 'wonder tree' spread to western countries and after a lot of researches funded by internationally acclaimed organisations like UN, neem and its products were accepted for their therapeutic value and having no side effects in US, UK, Australia among others.
Neem tree has miraculous powers and scientists are beginning to unfold the powers and potential of this revered tree. It is now being cultivated and grown in a number of countries to fully tap its potential and used on a commercial basis.