and since the balance of kindness vs. jerkiness is always perpetually maintained by the very nature of yin yang principle on opposing forces. the levels of kindness in existence right now is already at maximum. and you're insistence that there should be more kindness reflects an inability on your part to appreciate the bountiful kindness which already exists.
so it's not that there is a lack of kindness. but a lack of either appreciation or understanding or both on you part....
so a sign stating "humankind, be both". suggests and insinuates
1.) that we are neither.
2.) that "human" is intrinsically better than other species
3.) people who act in an unkind manner lose their humanity
so I find your post intellectually offensive despite my own staggering obvious shortcomings in the intellect department.