And when did the human population rise above every other animal/lifeform on this planet?
Unfortunately it's people like you that are the root cause of many of the problems of today!
Humans aren't the only thing that matter, Rhinos are part of a complex ecosystem that is being destroyed at an ever increasing pace. Rhinos shouldn't suffer because humans have reached plague like proportions on this planet.
It's a molten rock spinning through empty space. On the grand scheme of things rhinos and everything else on Earth are beyond insignificant. At least humans have a chance of LEAVING one day.
But let's say the human plague is removed from earth and we have this wonderful natural paradise of animals and plants. So what? There would be nobody there to post pictures of it on facebook or make inane BBC documentaries about it, so what's the point?? Then an asteroid will come along and kill it all anyway.