Richard Leakey — Kenyan Environmentalist born on December 19, 1944,

Richard Erskine Frere Leakey is a Kenyan paleoanthropologist, conservationist, and politician. He is second of the three sons of the archaeologists Louis Leakey and Mary Leakey, and is the younger half-brother of Colin Leakey... (wikipedia)

Elephants can live to an age of up to 70 or 80 years and they have a good memory. It could be they come across an area that is experiencing a drought. Then they continue on their path and run into people.
A number of scientists with greatly different backgrounds can come up with completely different assessments. The discussions or controversies are endless. Once a year, we try to bring the most important discoverers together to exchange their experiences and knowledge.
Earlier, 100,000 elephants lived in Kenya and we didn't have any noteworthy problem with it. The problem that we have is not that there are now more elephants.
Primates need good nutrition, to begin with. Not only fruits and plants, but insects as well.
One should not forget that there are very few surviving items from this period, often just single, small bones, a tooth, a sliver of the skull. Categorizing these pieces can be very difficult.