L. Oppenheim, International Law. A Treatise. Volume 1…
“ And who can undertake to lay down a hard-and-fast rule with regard to the amount of inhumanity on the part of a Government that would justify intervention according to the Law of Nations?No State will ever intervene in the affairs of another if it has not some important interest in doing so, and it has always been easy for such State to find or pretend some legal justification for an intervention, be it self-preservation, balance of power, or humanity. There is no great danger to the welfare of the States in the fact that intervention is de facto a matter of policy. ”
