5. The cause is over-population.
My reading of history indicates that whenever someone speaks of there being "too many people", they actually mean "too many
other people". They never seem to volunteer to mitigate the problem. In some cultures, the aged voluntarily go off alone to die; I know of no other cases of voluntary death for the purposes of relieving population pressure.
7. Too many rats in the cage. Yup!
The last society that began by likening populations to rats ended by building Auschwitz.