One animal, human, child gets a disease and suffers through months/years, of pain before finally being allowed to die.
Another animal, human, child gets hit by a truck and dies instantly.
If there is a designated day for death, well both paths led to it... one just had to suffer while the other didn't... why should one squirrel suffer and the other have no pain? Why should one child suffer, while another dies instantly?
If nature is the only law at work, makes sense, totally random. Totally cyclic with no bias at all.
But if there's some higher design that justifies suffering for some and not others.... suffering for some who are not mature minds who understand and are responsible for their actions and are punished accordingly, but not others who are the same... well that's not a design, nor a creator, I have any desire to wrap my head around. Same reason I don't need to know WHY the serial killer does what he does... the fact that it's done at all makes me ill enough. And I most especially wouldn't respect, n'mind worship, such a mindset.
That said, I think that all the good in the world resides in the human heart (or rather head) and likewise for all evil. Death isn't good or evil, it's just nature. Everything dies. It's when humans interfere with nature that you see what we define as good or evil in action.
A man rescuing a child from a burning building we define as good. That same man killing that same child because of the wiring in his head we define as evil. In the end it was the man who committed either act, based on the impulses and justifications in his head. No devil, nor any god, made him do it by whispering in his ear.
We like to label nature as cruel, but that's simply personification. That's us putting our emotions onto something that has none because it makes it easier for us to understand. Nature isn't cruel, it's just there. It has its cycles, and try as we may we've yet to conquer it completely. We've made strides, huge strides. But still we die just as a squirrel does when our time comes.
Holidays... irony in me calling anything a Holy Day but that's semantics... mine revolve around family, seeing them, catching up, showing you care... that's what it boils down to for me. If calling it a Holy Day gets us off our butts and gets us all in the same house and sharing hugs then so be it. Great if you didn't need the excuse, but I'll take my hugs any way I can get them because all too soon you won't be there to give me any more.