Why Can't We All Get Along?

If lions and tigers can manage it don't you think humans should be able to?

"The cubs were born as a result of a genuine attachment between the lion and the tigress who have been kept in neighboring cages since childhood. Such a cross would be impossible in a natural environment, since tigers and lions only mate with their kin."

They took it upon themselves, this wasn't laboratory induced. I'll know the world has changed for the better when we have sholphins or wharks.