What is the overall tone of this poem?

Hap
by Thomas Hardy

If but some vengeful god would call to me
From up the sky, and laugh: “Thou suffering thing,
Know that thy sorrow is my ecstasy,
That thy love’s loss is my hate’s profiting!”
Then would I bear, and clench myself, and die,
Steeled by the sense of ire unmerited;
Half-eased, too, that a Powerfuller than I
Had willed and meted me the tears I shed.

But not so. How arrives it joy lies slain,
And why unblooms the best hope ever sown?
—Crass Casualty obstructs the sun and rain,
And dicing Time for gladness casts a moan….
These purblind Doomsters had as readily strown
Blisses about my pilgrimage as pain.